'Seventy' in the Bible

If seven lives are to be taken as punishment for Cain's death, seventy-seven will be taken for Lamech's.

And Kenan was seventy years old when he became the father of Mahalalel:

And all the years of Lamech's life were seven hundred and seventy-seven: and he came to his end.

And Terah was seventy years old when he became the father of Abram, Nahor, and Haran.

So Abram went as the Lord had said to him, and Lot went with him: Abram was seventy-five years old when he went away from Haran.

Now the years of Abraham's life were a hundred and seventy-five.

And the sons of Joseph whom he had in Egypt were two. Seventy persons of the family of Jacob came into Egypt.

And the forty days needed for making the body ready went by: and there was weeping for him among the Egyptians for seventy days.