Lamech knows that God will avenge Cain seven times. Alternate translation: "Since God will punish anyone who kills Cain seven times, Lamech" (See: [[rc://en/ta/man/translate/figs-activepassive]])
This can be stated in active form. Alternate translation: "whoever kills me, God will punish seventy-seven times" (See: [[rc://en/ta/man/translate/figs-activepassive]])