Genesis Session XXV
Genesis 4:15–26 | 13-February-2026
City of Man and the Foundation of God
Note: The following is a structured summary of the teaching. For the full exposition, please refer to the embedded video above.
From the Fall to the First City
As we move from Genesis 3 into Genesis 4, we continue to study Scripture in the light of the New Testament. Sin entered in Genesis 3, and with sin came death — spiritual death first, and eventually physical death. But the first recorded physical death in Scripture occurs in Genesis 4.
In our previous sessions, we examined why God accepted Abel’s offering and rejected Cain’s. We then studied why Cain killed Abel, and we walked through Genesis 4:14 — the punishment of Cain.
God cursed the work of Cain’s hands. Yet even in judgment, God showed mercy. He placed protection upon Cain’s life and gave him opportunity to repent. Within Cain’s response, we may have seen the first signs of sorrow — sorrow that could lead to repentance. His concern was not primarily that the ground was cursed, but that he would be hidden from the presence of God.
Genesis 4:14 — “Surely You have driven me out this day from the face of the ground; I shall be hidden from Your face; I shall be a fugitive and a vagabond on the earth, and it will happen that anyone who finds me will kill me.”
Though Cain was already outside Eden, he was still in communion with God. God was speaking to him. Now he would go out from the presence of the Lord. Separation from the presence of God is always the greater judgment.
Our Study Today
Genesis 4 could have ended with Cain’s punishment. But God continues. For the next ten verses, the Holy Spirit records the genealogy of Cain. This is the first genealogy in Scripture.
We now read Genesis 4:15–26.
Summary of Genesis 4:15 Onward
God places a mark of protection upon Cain. We previously studied the nature of that mark. Today we continue further.
The Lord proclaims that whoever kills Cain will receive vengeance sevenfold. Cain moves into the land of Nod, east of Eden. He has a son named Enoch. And Cain builds a city — the first city recorded in Scripture.
The Holy Spirit then walks us through six generations from Cain. We see development. We see culture. We see tools and technology. Civilization begins to take shape.
Then Scripture introduces Lamech — the seventh generation from Adam through Cain. Lamech takes two wives. He murders. And he proclaims that if Cain was avenged sevenfold, he himself will be avenged seventy-sevenfold.
After this, the genealogy of Cain ends. God shifts the narrative back to Adam and introduces Seth — another seed appointed in place of Abel.
With that summary, let us now go verse by verse.
The Sevenfold Vengeance
Genesis 4:15 — “And the LORD said to him, ‘Therefore, whoever kills Cain, vengeance shall be taken on him sevenfold.’ And the LORD set a mark on Cain, lest anyone finding him should kill him.”
The phrase “sevenfold” signifies completeness — fullness — that which is whole and fulfilled.
When the Lord declares that vengeance shall be taken sevenfold upon the one who kills Cain, He is declaring complete judgment. The one who sheds Cain’s blood will receive the fullness of divine recompense.
Cain killed Abel. Yet Cain received mercy. God punished him, but He did not execute immediate death upon him. Instead, God placed a mark of protection upon him.
If another man attempts to execute vengeance upon Cain, that man will not receive the mercy Cain received. He will receive the fullness of judgment. Vengeance belongs to God.
The Righteous Judge
In Genesis 4:15, we are introduced to a vital attribute of God — the Righteous Judge.
This is the first time in Scripture that God explicitly declares Himself as the One who will execute vengeance. In Genesis 3, God punished Adam and Eve, yet He clothed them, promised the Seed, and preserved their lives.
“Whoever kills Cain, vengeance shall be taken on him sevenfold.” Here God establishes that vengeance belongs to Him alone.
God does not execute vengeance upon Cain for killing Abel. Instead, He protects him. He places a mark upon him and declares that anyone who seeks to avenge Abel’s blood will fall under complete judgment.
Cain is punished — the ground is cursed to him, he is driven out, and he is exiled from the presence of the Lord. But the sentence of death is delayed.
The delay is mercy, and the purpose of that mercy is repentance.
Deuteronomy 32:35 declares, “Vengeance is Mine, and recompense.” Romans 12:19 repeats the same truth: “Vengeance is Mine, I will repay,” says the Lord.
In Genesis 4, the Righteous Judge reveals His character: just and longsuffering, restraining final judgment so that repentance may yet occur.
Cain and God’s Mercy
Genesis 4:16 — “Then Cain went out from the presence of the LORD and dwelt in the land of Nod on the east of Eden.”
Genesis 4:17 — “And Cain knew his wife, and she conceived and bore Enoch. And he built a city, and called the name of the city after the name of his son—Enoch.”
Cain received mercy. God had punished him. Yet God protected his life. The mercy of God should lead a man to repentance (Romans 2:4).
Cain went out from the presence of the Lord. The land was called Nod — wandering. Yet he settled there.
Instead of returning to the presence of God, Cain builds. Mercy was given that he might repent. Instead, he builds a city.
Pre-Flood and Post-Flood — Mercy Misused
Cain builds a city after receiving mercy. That is not a small detail. It reveals what the heart can do with the mercies of God.
This pattern will repeat again after the flood. After the flood, God shows mercy to mankind and promises that He will not destroy the earth again by water. Judgment is restrained. The world is preserved. And yet, what happens next? Men gather and build in the east. They settle. They establish themselves. They seek permanence without God.
So the issue is not that mercy was lacking. The issue is what the heart does after receiving mercy.
A man can receive the mercies of God and use them for his own growth — for his own settling — for his own increase — instead of returning to the Father. Like the prodigal son, who desired the gifts but not the presence of his father, so also the heart can take mercy and turn it into independence.
Cain received mercy, but he did not use it to return to the Lord. He used it to build.
And later, Nimrod is not the beginning of this pattern — he is following the way of Cain.
Cain and David — Two Responses When God Confronts Sin
Both Cain and David knew God. And both committed murder.
Cain killed the righteous Abel. David killed the righteous Uriah.
In both cases, God met the sinner.
God met Cain and warned him before the act — calling him to rule over sin, not be ruled by it. After Cain murdered Abel, God confronted Cain again, exposed the sin, punished him, and still showed mercy by preserving his life.
David was confronted through the prophet Nathan. Nathan came, exposed David’s sin, and God punished him. The consequences were severe. Yet God showed mercy to David as well.
What did Cain do with mercy? He went out from the presence of the Lord and built a city.
What did David do with mercy? He fell before the Lord.
Psalm 51 records David’s cry: “Do not cast me away from Your presence, and do not take Your Holy Spirit from me.” (Psalm 51:11)
David used mercy as it was meant to be used — to return to the Lord. Cain used mercy to settle away from God.
So mercy reveals the heart. The same mercy that is meant to lead a man to repentance can be taken and used for self-preservation and selfish growth. One man returns to the presence of God. Another builds a city away from Him.
The First Genealogy — Civilization Develops Apart From God
Genesis 4:18–22
For the first time in Scripture, the Holy Spirit records a genealogy. The line of Cain unfolds before us: Enoch, Irad, Mehujael, Methushael, and Lamech.
This genealogy is not merely historical record. It is theological revelation. We are watching the development of the city of man.
Cain built the first city. Now his descendants build civilization.
Enoch’s name carries the idea of dedication or beginning. The city named after him marks the beginning of structured human settlement apart from God. What began as wandering now becomes settling.
As the generations continue, specialization emerges. Jabal is called the father of those who dwell in tents and have livestock. Jubal is the father of those who play the harp and flute. Tubal-Cain becomes an instructor of every craftsman in bronze and iron.
Livestock. Music. Metalwork. Agriculture advances. Art is formed. Industry develops. Civilization progresses.
Sin did not eliminate man’s ability to create. It did not remove intelligence. It did not remove skill. In fact, under the providence of God, human culture expands.
But something is absent. There is no altar recorded. There is no calling upon the name of the Lord. There is no seeking of God mentioned in this lineage.
The genealogy advances materially — but not spiritually.
God allows innovation. God allows growth. God allows the world to multiply. But development does not equal righteousness.
The city grows. Culture refines. Tools improve. Music fills the air. Metal is shaped into instruments and weapons. Yet the presence of God is not sought.
This is civilization without communion. And the genealogy does not end with worship. It ends with Lamech.
Lamech — Seventy-Sevenfold Wrath
Genesis 4:23–24
The genealogy now slows down. God pauses on Lamech. Until this point, the narrative has shown cultural development. Now it reveals moral corruption.
Lamech is the seventh generation from Adam through Cain. Here we see the fullness of the way of Cain.
First, polygamy enters the record. When God created Adam, He gave him Eve — one man and one woman. But now man alters the order. Lamech takes two wives. This is not presented as God’s pattern, but as man’s deviation.
Then comes murder — but with a difference. Cain killed Abel and feared vengeance. Lamech does not tremble. He boasts.
‘If Cain shall be avenged sevenfold, then Lamech seventy-sevenfold.’
Cain received a word from God — sevenfold vengeance would be taken by God. Lamech takes that word and magnifies it. He does not appeal to God. He declares vengeance himself.
This is not divine justice. This is human wrath. The fear of God is gone. Pride has replaced trembling.
In Matthew 18, Peter asks the Lord how many times he should forgive his brother. Jesus responds, ‘I do not say to you, up to seven times, but up to seventy times seven.’
Lamech proclaims seventy-sevenfold vengeance. Christ proclaims seventy times seven forgiveness. The line of Cain multiplies vengeance. The line of Christ multiplies mercy.
Here, in Lamech, we see the maturing of the city of man — culture refined, but the heart hardened.
Seth — The Foundation God Lays
Genesis 4:25–26
After showing us the development of the city of man, Scripture returns to the root — back to Adam and Eve.
The genealogy of Cain ends in vengeance. The narrative now introduces another seed.
Eve says, “God has appointed another seed for me instead of Abel.” The name Seth carries the idea of appointed, placed, or foundation.
While man is busy building cities, God is laying a foundation.
Man builds outward. God builds downward.
The city of Cain rises in culture, strength, and innovation. But God’s work begins quietly — through a seed.
Seth is not introduced with tools or music or metallurgy. He is introduced as appointed.
From Seth comes Enosh.
The name Enosh carries the idea of weakness — frailty — mortal man.
And here the narrative shifts again: “Then men began to call on the name of the LORD.”
This is not merely private prayer. The Hebrew carries the sense of proclaiming or invoking the name of the LORD.
For the first time since the fall, a line is marked not by city-building, but by calling upon God.
Throughout Scripture, calling upon the name of the LORD is covenant language. Abraham builds an altar and calls upon the name of the LORD (Genesis 12:8; 13:4). Isaac builds an altar and calls upon the name of the LORD (Genesis 26:25). Joel declares, “Whoever calls on the name of the LORD shall be saved” (Joel 2:32). Peter applies that to Christ (Acts 2:21). Paul repeats it in Romans 10:13.
The covenant name YHWH, applied in the Old Testament, is revealed in the New Testament as fulfilled in Christ.
The church is described as those who call upon the name of the Lord (1 Corinthians 1:2).
Calling upon His name marks separation. It marks dependence. It marks humility.
The line of Cain builds cities. The line of Seth calls upon the Lord.
One settles in strength. The other lives in weakness.
One multiplies vengeance. The other seeks mercy.
This is the dividing line of Genesis 4. We are either building cities — or living as pilgrims. We are either multiplying vengeance — or calling upon the name of the Lord.
Closing — The Two Foundations
Genesis 4 presents two lines.
One line builds cities. The other calls upon the Lord.
The line of Cain receives mercy and uses it to establish strength apart from God. Civilization grows. Culture advances. Tools are refined. Music is created. Metal is shaped. But the heart hardens. Vengeance multiplies. Pride matures.
The line of Seth begins not with strength, but with weakness. Enosh — frail man. And in weakness, men begin to call upon the name of the LORD.
This is the foundation God lays.
The city of man seeks permanence through structure. The kingdom of God begins with calling upon His name.
The way of Cain settles in independence. The way of Seth lives in dependence.
The mercy of God is still extended today. The Righteous Judge still delays final judgment. Longsuffering continues. But mercy has purpose — that men may repent and call upon His name.
The question of Genesis 4 remains before us:
Are we building cities — or seeking the Lord? Are we multiplying vengeance — or walking in mercy? Are we strengthening ourselves — or acknowledging our weakness before God?
Living righteously hastens the coming of the Lord. The only way to be preserved from the city of man is to belong to the foundation God lays.
We are either of the way of Cain — or we are of the line that calls upon the name of the LORD.
