DAN 9:2

2 In the shnat achat of his reign, I, Daniel, received binah [(understanding)] from the Sfarim [(books, Kitvei Hakodesh)] of the number of the shanim, that the Devar Hashem was unto Yirmeyah HaNavi, with respect to the desolations of Yerushalayim, SHIVIM SHANAH must be completed.