Genesis 4:24 in the King James Version
If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold.
Context
23 Lamech said to his wives, “Adah and Zillah, hear my voice. You wives of Lamech, listen to my speech, for I have slain a man for wounding me, a young man for bruising me.
24 If Cain will be avenged seven times, truly Lamech seventy-seven times.”
25 Adam knew his wife again. She gave birth to a son, and named him Seth, saying, “for God has given me another child instead of Abel, for Cain killed him.”