Sevenfold vengeance will be given for Cain, but for Lamech, seventy-seven times.
Other versions
King James Version
If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold.English Standard Version
If Cain's revenge is sevenfold, then Lamech's is seventy-sevenfold."New International Version
If Cain is avenged seven times, then Lamech seventy-seven times."