Genesis 47:26
And Joseph made it a law over the land of Egypt to this day, that Pharaoh should have the fifth part, except the land of the priests only, which became not Pharaoh's.
Nave's Topical Index—AKJV

Ezra 7:24
Also we certify you, that touching any of the priests and Levites, singers, porters, Nethinims, or ministers of this house of God, it shall not be lawful to impose toll, tribute, or custom, on them.
Nave's Topical Index—AKJV