Leviticus 21:21-23
21 No descendant of Aaron the priest who has any defect is to come near to present the offerings made to the Lord by fire. He has a defect; he must not come near to offer the food of his God.
22 He may eat the most holy food of his God, as well as the holy food;
23 yet because of his defect, he must not go near the curtain or approach the altar, and so desecrate my sanctuary. I am the Lord, who makes them holy.’”