Genesis 47:22; Genesis 47:26

22 Only the land of the priests he did not buy, for the priests had an allotment from Pharaoh, and they lived off the allotment which Pharaoh gave them. Therefore , they did not sell their land.
26 Joseph made it a statute concerning the land of Egypt valid to this day, that Pharaoh should have the fifth; only the land of the priests did not become Pharaoh's.