2 Chronicles 36:21 in the King James Version
To fulfil the word of the LORD by the mouth of Jeremiah, until the land had enjoyed her sabbaths: for as long as she lay desolate she kept sabbath, to fulfil threescore and ten years.
Context
20 He carried those who had escaped from the sword away to Babylon, and they were servants to him and his sons until the reign of the kingdom of Persia,
21 to fulfill the LORD’s word by Jeremiah’s mouth, until the land had enjoyed its Sabbaths. As long as it lay desolate, it kept Sabbath, to fulfill seventy years.
22 Now in the first year of Cyrus king of Persia, that the LORD’s word by the mouth of Jeremiah might be accomplished, the LORD stirred up the spirit of Cyrus king of Persia, so that he made a proclamation throughout all his kingdom, and put it also in writing, saying,