'Seventy' in the Bible

This whole area will become a desolate wasteland. These nations will be subject to the king of Babylon for seventy years.'

"'But when the seventy years are over, I will punish the king of Babylon and his nation for their sins. I will make the land of Babylon an everlasting ruin. I, the Lord, affirm it!

"For the Lord says, 'Only when the seventy years of Babylonian rule are over will I again take up consideration for you. Then I will fulfill my gracious promise to you and restore you to your homeland.