Leviticus 21:21-23

No descendant of the priest Aaron who has a defect is to come near to present the food offerings to the LORD. He has a defect and is not to come near to present the food of his God. He may eat the food of his God from what is especially holy as well as from what is holy. But because he has a defect, he must not go near the curtain  or approach the altar. He is not to desecrate my holy places, for I am the LORD who sets them apart.”