Deuteronomy 15:4 (KJV)

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;

Only if thou carefully hearken unto the voice of the LORD thy God, to observe to do all these commandments which I command thee this day.

For the LORD thy God blesseth thee, as he promised thee: and thou shalt lend unto many nations, but thou shalt not borrow; and thou shalt reign over many nations, but they shall not reign over thee.

If there be among you a poor man of one of thy brethren within any of thy gates in thy land which the LORD thy God giveth thee, thou shalt not harden thine heart, nor shut thine hand from thy poor brother:

But thou shalt open thine hand wide unto him, and shalt surely lend him sufficient for his need, in that which he wanteth.

Beware that there be not a thought in thy wicked heart, saying, The seventh year, the year of release, is at hand; and thine eye be evil against thy poor brother, and thou givest him nought; and he cry unto the LORD against thee, and it be sin unto thee.