Leviticus 25:37

37 You shall not give him your silver at interest nor your food for gain.

Deuteronomy 23:19

19 “^aYou shall not charge interest to your brother: interest on money, food, or anything that may be loaned at interest.

Deuteronomy 23:20

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20 ^aYou may charge interest to a foreigner, but to your brother you shall not charge interest, so that ^bYahweh your God may bless you in all ¹that you send forth your hand to do in the land which you are about to enter to ²possess.