Leviticus 25:33-34

JPS_ASV_Byz(i) 33 And if a man purchase of the Levites, then the house that was sold in the city of his possession, shall go out in the jubilee; for the houses of the cities of the Levites are their possession among the children of Israel. 34 But the fields of the open land about their cities may not be sold; for that is their perpetual possession.