Leviticus 25:16

then he shall calculate the years since its sale and return the balance to the man to whom he sold it, and so return to his possession of land.

‘If there are still many years, he shall return part of his purchase price in proportion to them for his own redemption;

in the first year of his reign, I, Daniel, discerned in the books the number of the years concerning which the word of Yahweh came to Jeremiah the prophet for the fulfillment of the laying waste of Jerusalem, namely, seventy years.