Leviticus 21:18

15 He shall not profane his seed among his people: for I am Yahweh who sanctifies him.

16 Yahweh spoke to Moses, saying,

17 Speak to Aaron, saying, Whoever he be of your seed throughout their generations that has a blemish, let him not approach to offer the bread of his God.

18 For whatever man he be that has a blemish, he shall not approach: a blind man, or a lame, or he that has a flat nose, or any deformity,

19 or a man that is broken-footed, or broken-handed,

20 or crook-backed, or a dwarf, or that has a blemish in his eye, or is scurvy, or scabbed, or has his stones broken;

21 no man of the seed of Aaron the priest, that has a blemish, shall come near to offer the offerings of Yahweh made by fire: he has a blemish; he shall not come near to offer the bread of his God.