Genesis 4:8-16 ESV
Cain spoke to Abel his brother. And when they were in the field, Cain rose up against his brother Abel and killed him. Then the LORD said to Cain, “Where is Abel your brother?” He said, “I do not know; am I my brother’s keeper?” And the LORD said, “What have you done? The voice of your brother’s blood is crying to me from the ground. And now you are cursed from the ground, which has opened its mouth to receive your brother’s blood from your hand. When you work the ground, it shall no longer yield to you its strength. You shall be a fugitive and a wanderer on the earth.” Cain said to the LORD, “My punishment is greater than I can bear. Behold, you have driven me today away from the ground, and from your face I shall be hidden. I shall be a fugitive and a wanderer on the earth, and whoever finds me will kill me.” Then the LORD said to him, “Not so! If anyone kills Cain, vengeance shall be taken on him sevenfold.” And the LORD put a mark on Cain, lest any who found him should attack him. Then Cain went away from the presence of the LORD and settled in the land of Nod, east of Eden.
Judgment & mercy... Cain complains about his punishment and attempts to manipulate God by exaggerating it, adding to God's words, implying that the additions are natural implications of God's words. A very familiar strategy, no?
God clarifies... and protects Cain's life with a mark and a consequence should Cain be killed.
Cain, Enoch, Irad, Mehujael, Methushael, Lamech...
Genesis 4:19–24 ESV
And Lamech took two wives. The name of the one was Adah, and the name of the other Zillah. Adah bore Jabal; he was the father of those who dwell in tents and have livestock. His brother’s name was Jubal; he was the father of all those who play the lyre and pipe. Zillah also bore Tubal-cain; he was the forger of all instruments of bronze and iron. The sister of Tubal-cain was Naamah.
Lamech said to his wives:
“Adah and Zillah, hear my voice; you wives of Lamech, listen to what I say: I have killed a man for wounding me, a young man for striking me. If Cain’s revenge is sevenfold, then Lamech’s is seventy-sevenfold.”