'Seventy' in the Bible

If Cain shall be avenged sevenfold, Truly Lamech seventy and sevenfold.

And Kenan lived seventy years, and begat Mahalalel:

And all the days of Lamech were seven hundred seventy and seven years: and he died.

And Terah lived seventy years, and begat Abram, Nahor, and Haran.

So Abram went, as Jehovah had spoken unto him; and Lot went with him: and Abram was seventy and five years old when he departed out of Haran.