Leviticus 25:37

25:37 You must not lend him your money at interest and you must not sell him food for profit.

Leviticus 25:51

25:51 If there are still many years, in keeping with them he must refund most of the cost of his purchase for his redemption,

Leviticus 27:15

27:15 If the one who consecrates it redeems his house, he must add to it one fifth of its conversion value in silver, and it will belong to him.