Thematic Bible: Specially required to avoid

And the LORD said to Moses, "Speak to the priests, the sons of Aaron, and say to them: No one shall make himself unclean for the dead among his people, except for his closest relatives, his mother, his father, his son, his daughter, his brother, or his virgin sister (who is near to him because she has had no husband; for her he may make himself unclean). read more.
He shall not make himself unclean as a husband among his people and so profane himself. They shall not make bald patches on their heads, nor shave off the edges of their beards, nor make any cuts on their body. They shall be holy to their God and not profane the name of their God. For they offer the LORD's food offerings, the bread of their God; therefore they shall be holy.

He shall not go in to any dead bodies nor make himself unclean, even for his father or for his mother. He shall not go out of the sanctuary, lest he profane the sanctuary of his God, for the consecration of the anointing oil of his God is on him: I am the LORD.