'Seventy' in the Bible

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

And Cainan lived seventy years, and begat Mahalaleel:

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