Genesis 47:20-25

So Joseph bought all the land in Egypt for Pharaoh. The Egyptians, one and all, sold their fields, because the famine was too severe for them. The land became Pharaoh’s, and Joseph reduced the people to servitude, from one end of Egypt to the other. However, he did not buy the land of the priests, because they received a fixed allowance from Pharaoh and had food enough from the allowance Pharaoh gave them. That is why they did not sell their land. Joseph said to the people, ‘Now that I have bought you and your land today for Pharaoh, here is seed for you so you can plant the ground. But when the crop comes in, give a fifth of it to Pharaoh. The other four-fifths you may keep as seed for the fields and as food for yourselves and your households and your children.’ ‘You have saved our lives,’ they said. ‘May we find favour in the eyes of our lord; we will be in bondage to Pharaoh.’