'Priests' in the Bible

Only the land of the priests he did not buy, for the priests had an allotment from Pharaoh, and they lived on the amount which Pharaoh gave them, so they did not sell their land.

And Joseph made it a law over the land of Egypt—valid to this day—that Pharaoh should have the fifth part [of the crops]; only the land of the priests did not become Pharaoh’s.