36:21 to fulfill the word of Yahweh by the mouth of Jeremiah, until the land had enjoyed its Sabbaths: [for] as long as it lay desolate it kept Sabbath, to fulfill seventy years.
-World English Bible
Other Translation
36:21 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.
-King James Version