Leviticus 25:22-24

²²and ye shall sow in the eighth year, and ye shall eat eld fruits till to the ninth year; (yea), till new things come forth, ye shall eat the eld things.

²³Also the land shall not be sold into without end, for it is mine, and ye be my comelings, and my tenants;

²⁴wherefore all the country of your possession shall be sold under the condition of again-buying. (and so all the land of your possession shall be sold under the condition of being able to buy it back.)