Leviticus 21:20-21

20A priest with a back that is not straight must not offer food to God. Neither must a priest who is very small offer a food gift. A priest who has an eye disease or a skin disease must not offer food to God. Neither must a priest offer food if his testicles are spoiled.

21If a priest's son has something wrong with his body, he must not come near to the altar. He must not give the food offering to the Lord.