Leviticus 21:17-21

17“Say to Aaron: ‘For the generations to come none of your descendants who has a defect may come near to offer the food of his God. 18No man who has any defect may come near: no man who is blind or lame, disfigured or deformed; 19no man with a crippled foot or hand, 20or who is a hunchback or a dwarf, or who has any eye defect, or who has festering or running sores or damaged testicles. 21No descendant of Aaron the priest who has any defect is to come near to present the food offerings to the Lord. He has a defect; he must not come near to offer the food of his God.