Divrey Hayamim Bais 36:21
Divrey Hayamim Bais 36:21 TOJB2011
To fulfil the Devar HASHEM by the mouth of Yirmeyahu, until HaAretz had made up for its Shabbatot, for as long as she lay desolate she was shomer Shabbos, to fulfil Shivim Shanah (seventy years).