Leviticus 21:1-5

The Holiness of the Priests

Then Yahweh said to Moses, “Speak to the priests, the sons of Aaron, and say to them:
‘^aNo one shall defile himself for a dead person among his people, 2 ^aexcept for his ¹blood relatives who are nearest to him, his mother and his father and his son and his daughter and his brother, 3 also for his virgin sister, who is near to him ¹because she has had no husband; for her he may defile himself. 4 He shall not defile himself as a ¹relative by marriage among his people, and so profane himself. 5 ^aThey shall not make any baldness on their heads ^bnor shave off the edges of their beards ^cnor make any cuts in their flesh.