So Joseph established a law that a fifth of the produce belongs to Pharaoh, and it is in effect in the land of Egypt to this day. Only the priests’ land does not belong to Pharaoh.
Jewish Publication Society of America Version (JPS1917) - Genesis 47:26 >And Joseph made it a statute concerning the land of Egypt unto this day, that Pharaoh should have the fifth; only the land of the priests alone became not Pharaoh's.