Genesis 47:20-25

So Joseph bought all the land of Egypt for Pharaoh; for the Egyptians sold every man his field, because the famine was sore upon them: and the land became Pharaoh’s. And as for the people, he removed them to the cities from one end of the border of Egypt even to the other end thereof. Only the land of the priests bought he not: for the priests had a portion from Pharaoh, and did eat their portion which Pharaoh gave them; wherefore they sold not their land. Then Joseph said unto the people, Behold, I have bought you this day and your land for Pharaoh: lo, here is seed for you, and ye shall sow the land. And it shall come to pass at the ingatherings, that ye shall give a fifth unto Pharaoh, and four parts shall be your own, for seed of the field, and for your food, and for them of your households, and for food for your little ones. And they said, Thou hast saved our lives: let us find favor in the sight of my lord, and we will be Pharaoh’s servants.