Leviticus 21:21-23

No descendant of Aaron who has a defect may approach the altar to present special gifts to the LORD. Since he has a defect, he may not approach the altar to offer food to his God. However, he may eat from the food offered to God, including the holy offerings and the most holy offerings. Yet because of his physical defect, he may not enter the room behind the inner curtain or approach the altar, for this would defile my holy places. I am the LORD who makes them holy.”