Leviticus 25:21-23

21Be assured that I will send my blessing for you in the sixth year, so the land will produce a crop large enough for three years.

22When you plant your fields in the eighth year, you will still be eating from the large crop of the sixth year. In fact, you will still be eating from that large crop when the new crop is harvested in the ninth year.

23“The land must never be sold on a permanent basis, for the land belongs to me. You are only foreigners and tenant farmers working for me.