Leviticus 25:36-37

³⁶If you lend money to him, do not charge any kind of interest DOU. Instead, show by what you do that you revere me, your God, and help that man, in order that he will be able to continue to live among you.

³⁷If you lend him money, do not charge interest; and if you sell food to him, charge him only what you paid for it; do not get a profit from it.