Leviticus 25:29-38

If a man sells a dwelling house in a walled city, it may be redeemed until a year has elapsed since its sale; the redemption period shall be a year. If it is not redeemed before a full year has elapsed, the house in the walled city shall pass to the purchaser beyond reclaim throughout the ages; it shall not be released in the jubilee. But houses in villages that have no encircling walls shall be classed as open country: they may be redeemed, and they shall be released through the jubilee. As for the cities of the Levites, the houses in the cities they hold--the Levites shall forever have the right of redemption. Such property as may be redeemed from the Levites--houses sold in a city they hold--shall be released through the jubilee; for the houses in the cities of the Levites are their holding among the Israelites. But the unenclosed land about their cities cannot be sold, for that is their holding for all time. If your kinsman, being in straits, comes under your authority, and you hold him as though a resident alien, let him live by your side: do not exact from him advance or accrued interest, but fear your God. Let him live by your side as your kinsman. Do not lend him your money at advance interest, or give him your food at accrued interest. I the Lord am your God, who brought you out of the land of Egypt, to give you the land of Canaan, to be your God.