Leviticus 21:1-6

1 And the LORD said unto Moses, Speak unto the priests the sons of Aaron, and say unto them, There shall none be defiled for the dead among his people:
2 But for his kin, that is near unto him, that is, for his mother, and for his father, and for his son, and for his daughter, and for his brother,
3 And for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.
4 But he shall not defile himself, being a chief man among his people, to profane himself.
5 They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.
6 They shall be holy unto their God, and not profane the name of their God: for the offerings of the LORD made by fire, and the bread of their God, they do offer: therefore they shall be holy.
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