In the Gospel of Matthew, chapter 16, Jesus leads His disciples to the district of Caesarea Philippi. It was a place dominated by a massive rock face dedicated to the worship of Pan, a site known historically as a center of pagan worship. Against this backdrop of looming cliffs and spiritual darkness, Jesus asks the most important question in human history: “Who do you say that I am?”
Peter answers with a flash of divine insight: “You are the Christ, the Son of the living God.”
Jesus’ response to Peter changes the trajectory of the world. He declares:
“And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it.” (Matthew 16:18, ESV)
For centuries, theologians have studied these words. They have parsed the grammar and argued over ecclesiastical authority. But to truly understand the weight of this promise, one must step out of the classroom and into the crucible of history. One must go where the "gates of hell" have swung wide open, threatening to swallow the faithful whole.
One must go to the Nineveh Plain.
In our modern era, few places have physically embodied the collision between the Kingdom of God and the powers of darkness like Northern Iraq. Here, ancient Christian communities, some dating back to the first century, faced the literal armies of death in the form of the Islamic State (ISIS). Their survival, and that of the Mar Mattai Monastery, serve as a living exegesis of Jesus’ promise. Antonio Graceffo wrote about his recent visit to Christians in Iraq’s Nineveh Plains. By looking at the original Greek of Matthew 16 and the testimony of those who survived the genocide of 2014, we can see that the Church is not merely a building that can be bombed, but a force that hell itself cannot contain.
Mar Mattai Monastery (the Monastery of Saint Matthew), Iraqi Kurdistan. Photo by Antonio Graceffo
Flesh and Blood vs. Divine Revelation
Before Jesus gives the promise of the Church’s invincibility, He highlights the source of Peter’s confession.
“Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven.” (Matthew 16:17, ESV)
The phrase “flesh and blood” translates the Greek σὰρξ καὶ αἷμα. In the Semitic idiom of the first century, this denoted human limitation. It referred to mere mortality, human wisdom, human strength, and human military strategy. Jesus is drawing a sharp line in the sand. The knowledge that Jesus is Lord does not come from human logic or political consensus; it is a revelation from God.
This distinction is palpable when you travel across the Nineveh Plain today.
The drive from the Kurdish capital of Erbil to the Mar Mattai Monastery (the Monastery of Saint Matthew) cuts across this historic region. It stretches east from the Tigris River near Mosul, encompassing roughly 3,600 square kilometers of flat, fertile land. To make this journey is to travel through a landscape defined by vulnerability. Graceffo traveled in an armored SUV, a necessary precaution in a land scarred by conflict. The vehicle’s thick glass and heavy doors, weighing nearly 200 pounds each, were a constant reminder of the "flesh and blood" dangers that persist.
As Graceffo rolled across the open terrain of agricultural fields, passing scattered villages of low concrete houses and shepherds tending flocks, the physical fragility of the Christian presence was obvious. These communities are ethnic Assyrians. They are the indigenous people of the land. They speak dialects of Aramaic, the very language Jesus spoke. Their liturgical language, the words they use to pray, remains ancient Aramaic. They trace their lineage to the missions of Addai and Mar Mari, disciples of the Apostle Thomas.
From a "flesh and blood" perspective, a σὰρξ καὶ αἷμα perspective, these communities should not exist. They are a small minority surrounded by a sea of volatility. They have no massive standing army, no oil wealth of their own, and they have been caught in the crossfire of empires for two millennia. Yet, they remain. Why? Because their existence is not sustained by political alliances alone, but by a revelation of who Jesus is.
As they drove, Graceffo’s translator Dlo, a member of the Free Burma Rangers (FBR), pointed out the window. "And this is another village," he said. "It’s called Al-Faf. They’re all Christian." They passed another. "Maghara. It’s called Maghara."
In Maghara, there is a playground. It was sponsored by Reload Love, an NGO that funds playgrounds for children in war zones, and installed by the Rangers during the fighting. It stands as a defiant splash of color in a dusty landscape. Dlo noted grimly, "ISIS tried to murder them because this village is very close to the front line."
From a human standpoint, building a playground on a front line is foolishness. But the Church does not operate on human wisdom. It operates on the revelation that life triumphs over death.
The Rock: Πέτρα (Petra) and the Living Stone
Jesus continues with a play on words that has defined ecclesiology for two thousand years.
“And I tell you, you are Peter, and on this rock I will build my church…” (Matthew 16:18, ESV)
In the original Greek, Jesus says, "You are Πέτρος (Petros), and on this πέτρα (petra) I will build my church."
Πέτρος refers to a stone, a fragment, or a rock that can be moved. πέτρα, however, refers to a bedrock, a massive ledge of rock, or a cliff face. While Roman Catholic theology views Peter himself as the rock of foundation, and Protestant theology often views Peter's confession of faith as the rock, the imagery implies stability that transcends the individual. It is the stability of the divine reality Christ brings.
This imagery of the πέτρα, the unshakeable bedrock, comes alive when you approach Mar Mattai.
The monastery does not sit on the mountain; it is carved into it. As our vehicle turned up the steep, winding road, the structure revealed itself, built into the living rock of Mount Maqloub. Founded in AD 363, it is the oldest Syriac Orthodox monastery in the world.
Father Joseph, a monk at the monastery, explained its origins. In the fourth century, Saint Matthew (Mar Mattai) fled persecution from the Roman Empire. He and 25 fellow monks journeyed along the Tigris River, seeking refuge. They found this mountain. "They were living in the caves first," Father Joseph said, "until miracles led them to build this monastery here."
For 1,600 years, this structure has clung to the πέτρα of Mount Maqloub. It has withstood the Persian Empire, the Arab conquests, the Mongols, the Ottomans, and finally, the Islamic State.
Dlo’s brother, Omar, a high-ranking member of the Kurdish security forces, traveled with us. He recalled the days when the "gates of hell" opened in 2014. "ISIS tried to take the monastery," Omar said. "They wanted to sneak up the mountain and destroy it, the same way they did in Mosul."
ISIS, in its campaign to erase history, sought to destroy the very foundations of the faith in the region. They blew up the tomb of Jonah (Nebi Yunus) in Mosul. They destroyed the monastery of Mar Behnam. They wanted to turn the πέτρα into dust.
But the promise of Jesus is that the Church is built on a rock that cannot be dynamited. It is a spiritual reality that anchors the believer even when the physical stones tremble.
The Church: Ἐκκλησία (Ekklesia) Under Fire
“…I will build my church…”
The word Jesus chooses here is vital. He does not use the word for "temple" (hieron) or "synagogue" (synagoge). He uses ἐκκλησία.
Ἐκκλησία comes from two roots: ek (out of) and kaleo (to call). It literally means "the called-out ones." In secular Greek usage, it referred to a gathering of citizens called out from their homes to assemble for civic business. Jesus co-opts this term to describe His people. The Church is not a shrine; it is a movement. It is people called out from the world to belong to Him.
This distinction became a matter of life and death in 2014.
Before ISIS, the Nineveh Plain was home to the largest concentration of Christians in Iraq, between 150,000 and 200,000 people. They lived in historic towns like Qaraqosh, Bartella, and Karamlesh. But in August 2014, the ἐκκλησία was forced to move.
Father Joseph described the collapse. "ISIS entered Mosul city and they seized everything there." On June 4, 2014, the assault began. By June 9, the city had fallen. A few weeks later, ISIS issued its infamous ultimatum to the Christians of Mosul: convert to Islam, pay the extortion tax (jizya), or die.
The buildings, the stone and mortar structures, were seized. Crosses were torn down. Ancient manuscripts were burned. If the Church were merely a building, Christianity in Iraq would have ended in 2014.
But the ἐκκλησία is a people.
"Virtually the entire Christian population fled overnight," Father Joseph recounted. They fled to Erbil and the Kurdistan Region. They lived in schools, unfinished malls, and displacement camps. The Mar Mattai monastery received about 70 displaced families, who lived within its ancient walls for months.
Jesus said, "I will build my ἐκκλησία." He did not promise that the buildings would never be taken. He promised to build His people. Even in the refugee camps of Erbil, the Church was alive. Liturgies were sung in tents. Baptisms were performed in plastic tubs. The "called-out ones" had been called out of their homes, yes, but they were still the Church.
Father Joseph noted that the Kurdish government (KRG), and specifically the Barzani family, opened their doors. "They opened their hearts before the gates," he said. Dlo, a Kurdish Muslim, echoed this sentiment of brotherhood. "This mountain is called Maqloub. It is a place where we, Christians, Yazidis, and Kurdish Muslims, have been living together for many, many years."
The ἐκκλησία found refuge not just in divine protection, but in the shared humanity of their neighbors, a testament to God’s common grace.
The Gates of Hades: Πύλαι ᾅδου (Pylai Hadou)
“…and the gates of hell shall not prevail against it.”
The phrase "gates of hell" is often misunderstood as a defensive image, as if the Church is a fortress and hell is battering against it. But in the ancient world, gates were defensive structures. If the "gates of hell" cannot prevail, it means the Church is on the offensive. It means the Church is attacking the strongholds of death, and the gates of death cannot withstand the assault.
However, there is another layer of meaning. The Greek πύλαι ᾅδου (pylai hadou) refers to the gates of Hades, the realm of the dead. It signifies the power of death itself, or the organized power of evil.
In 2014, the Nineveh Plain stared directly into the πύλαι ᾅδου.
The prophet Nahum once described Nineveh as the "bloody city," full of lies and robbery (Nahum 3:1). ISIS brought this ancient prophecy back to life. They were a death cult, glorifying execution, slavery, and destruction. They sought to establish a kingdom of death on the very soil where Jonah once preached repentance.
Omar explained the intelligence they received during the war: "They wanted to destroy the very ancient history." ISIS viewed the Christian presence as an affront to their ideology. They regarded Kurds, Yazidis, and Christians as infidels to be wiped out.
Father Joseph recalled how close the "gates" came to swallowing them. "ISIS vehicles reached the road near the village below Mar Mattai and remained there for about 20 minutes." They were less than three kilometers away. The monks watched from the monastery walls. The Peshmerga had withdrawn. The road was open.
"We were expecting that they were going to seize the monastery also," Father Joseph said.
It was a moment where the πύλαι ᾅδου seemed poised to triumph. The forces of death were at the doorstep. The darkness was tangible.
Shall Not Prevail: Κατισχύσουσιν (Katischysousin)
“…shall not prevail against it.”
The Greek verb here is κατισχύσουσιν. It is a compound word: kata (against/down) and ischuo (to be strong). It means to have strength against, to overpower, to hold down, or to check.
Jesus promises that the powers of death will never be strong enough to hold the Church down. They may hurt it. They may scatter it. They may kill the body (the "flesh and blood"). But they cannot κατισχύσουσιν, they cannot achieve total victory.
How was this promise fulfilled on the Nineveh Plain?
First, it was fulfilled through resistance. The "flesh and blood" of the Church rose up. Christians formed militias like the Nineveh Plain Protection Units (NPU) and Dwekh Nawsha ("Self-Sacrificing"). Dlo and Omar fought alongside coalition forces. The Peshmerga regrouped.
"Sometimes it was a real battle," Father Joseph recalled. ISIS attacked during fog and sandstorms, trying to breach the lines. Explosions shook the monastery "just like an earthquake." But the line held. The gates of hell pushed, but they could not overcome.
Second, it was fulfilled through resilience. In 2017, ISIS was defeated. The "Caliphate" that boasted it would conquer Rome crumbled into dust. And what happened next? The ἐκκλησία returned.
"After the liberation operation began, most of our places were completely destroyed," Father Joseph said. Yet, the Church led the rebuilding. They cleared the rubble. They de-mined the playgrounds. They consecrated the altars again.
Today, the bells ring across the Nineveh Plain. The NPU was recently restored as an independent force in October 2025, securing the Christian towns. The liturgy in Aramaic, the language of Jesus, is still chanted in Qaraqosh and Alqosh.
Father Joseph summed up this victory with a perspective forged in 1,600 years of history:
"At that time, when you were hearing the explosions and all this, you knew that it’s not new for us. The age of the monastery is more than 1,600 years. We have seen many wars. And by the blessing of Jesus Christ, through all these circumstances, the monastery survived."
The κατισχύσουσιν promise means that the Church plays the long game. Empires rise and fall. Dictators like Saddam Hussein come and go. Terror groups like ISIS flare up and burn out. But the Church remains.
"The Church exists much longer than any problem," Father Joseph said. "And that’s the promise of our Lord. We say that the gates of hell cannot stand against the Church."
The Keys of the Kingdom: Binding and Loosing
“I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.” (Matthew 16:19, ESV)
Jesus finishes his address to Peter with the imagery of keys (κλεῖδας) and the authority to bind (δήσῃς) and loose (λύσῃς).
In the Jewish context, binding and loosing referred to the authority of rabbis to forbid or permit certain actions, and to exclude or admit people into the community. Jesus grants this stewardship to Peter and the Church.
For the Syriac Orthodox Church, this connection to Peter is not abstract. Father Joseph explained that their patriarch, based in Damascus, is considered the 122nd successor to Saint Peter, who served as Bishop of Antioch before going to Rome. They view their stewardship of the faith as a direct line from this moment in Matthew 16.
But the true power of the "keys" lies in how the persecuted church unlocks the kingdom of heaven amid the hell of earth.
When ISIS came, they brought chains. They "bound" people in slavery and fear. The Church’s response was to "loose."
They loosed the bonds of hatred through forgiveness. It is a staggering reality that many Iraqi Christians pray for the conversion of their persecutors. Dlo mentioned the distinct worldview of the Kurds, that they are brothers with Christians. This relational "loosing" of ancient sectarian tensions allowed for survival. When the Peshmerga (Muslim Kurds) defended the Mar Mattai monastery, it was a manifestation of a kingdom principle: mercy triumphs over judgment.
Furthermore, the Church "loosed" resources. Father Joseph described how the Church coordinated shelter and food for thousands of families. "The goal was to ensure that refugees lived in safety and dignity," he said. In a time of scarcity, the Church unlocked generosity.
Promise for the Future
The drive back from Mar Mattai leaves one in a contemplative silence. The mountains of the Nineveh Plain stand as silent witnesses to centuries of bloodshed. The ruins of Nineveh, the "bloody city," are a reminder of human cruelty.
But the Monastery of Saint Matthew stands higher.
The survival of the ancient Christian communities in Iraq is not an accident of geopolitics. It is a theological signpost. It is evidence that Matthew 16:18 is not just poetic language.
When Jesus said the πύλαι ᾅδου (gates of hell) would not κατισχύσουσιν (prevail), He was making a guarantee that has been tested by fire.
Flesh and blood (σὰρξ καὶ αἷμα) cannot explain why these communities still exist.
The Rock (πέτρα) of Christ’s presence provided a foundation when the earth shook.
The Church (ἐκκλησία) proved to be a resilient people, not a fragile building.
As Father Joseph looked out over the plains where ISIS once roamed, he offered a final thought on the endurance of the faith:
"We are living here in the country. And that’s what keeps us, keeps our faith, that this is just a period and it’s going to end."
For the believer reading this today, perhaps you are facing your own "gates." They may not be the black flags of ISIS, but they may be the gates of sickness, depression, financial ruin, or cultural hostility. The promise remains the same. The gates of death have offensive power, yes. They are terrifying, yes. But they do not have the final word.
The Church is the anvil that has worn out many hammers. The Nineveh Plain is green again. The prayers are still rising in Aramaic. The Rock still stands.
And the gates of hell? They lie in ruins, while the Church marches on.
Reference: Antonio Graceffo, (2025). Ancient Monastery Town in Iraq Stood Against ISIS, Residents Refuse to Leave. Narrow Path Ministries. https://narrowpathministries.wordpress.com/2025/10/17/ancient-monastery-town-in-iraq-stood-against-isis-residents-refuse-to-leave-until-today/
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