Genesis 47:20-26

20So Joseph bought all the land of Egypt for Pharaoh because the Egyptians, each one, sold his field, for the famine overcame them. Thus the land became Pharaoh’s.

21He made the people slaves from one end of Egypt’s border to the other.

22Only he did not buy the land belonging to the priests, because the priests had an allotment from Pharaoh, and they ate their allotment that Pharaoh gave them. Therefore they did not sell their land.

23Then Joseph said to the people, “Behold, I have bought you and your land today for Pharaoh. Here is seed for you, so that you can sow the land.

24During the harvest you must give a fifth part to Pharaoh and four-fifths will be for you, for seed for the field and for your food, and for those in your houses, and for food for your little ones.”

25“You’ve saved our lives,” they said. “We find favor in the eyes of my lord, and we’ll be Pharaoh’s slaves.”

26So Joseph set it as a statute until this very day concerning the land of Egypt: a fifth-part goes to Pharaoh. Only the priests’ land did not become Pharaoh’s.