Leviticus 25:23-25

²³And the land shall not be sold for ever; for the land is mine; for ye are strangers and sojourners with me.

²⁴And in all the land of your possession ye shall grant a redemption for the land.

²⁵If thy brother grow poor, and sell of his possession, then shall his redeemer, his nearest relation, come and redeem that which his brother sold.