Genesis 4:23-25

One day Lamech said to his wives, “Adah and Zillah, hear my voice; listen to me, you wives of Lamech. I have killed a man who attacked me, a young man who wounded me. If someone who kills Cain is punished seven times, then the one who kills me will be punished seventy-seven times!” Adam had sexual relations with his wife again, and she gave birth to another son. She named him Seth, for she said, “God has granted me another son in place of Abel, whom Cain killed.”