Leviticus 21:21-24

²¹Whoever of the seed of Aaron the priest has a blemish on him, shall not draw nigh to offer sacrifices to thy God, because he has a blemish on him; he shall not draw nigh to offer the gifts of God.

²²The gifts of God are most holy, and he shall eat of the holy things.

²³Only he shall not approach the veil, and he shall not draw nigh to the altar, because he has a blemish; and he shall not profane the sanctuary of his God, for I am the Lord that sanctifies them.

²⁴And Moses spoke to Aaron and his sons, and to all the children of Israel.