Deuteronomy 15:1-3

At the end of every seven years thou shalt make a release. And this is the manner of the release: Every creditor that lendeth ought unto his neighbour shall release it; he shall not exact it of his neighbour, or of his brother; because it is called the LORD's release. Of a foreigner thou mayest exact it again: but that which is thine with thy brother thine hand shall release