2 Chronicles 36:20-21

And all who had not come to death by the sword he took away prisoners to Babylon; and they became servants to him and to his sons till the kingdom of Persia came to power: So that the words of the Lord, which he said by the mouth of Jeremiah, might come true, till the land had had pleasure in her Sabbaths; for as long as she was waste the land kept the Sabbath, till seventy years were complete.