Thematic Bible: Specially required to avoid

And Jehovah said to Moses, Speak unto the priests, the sons of Aaron, and say unto them, There shall none make himself unclean for a dead person among his peoples, except for his immediate relation, who is near unto him for his mother, and for his father, and for his son, and for his daughter, and for his brother; and for his sister, a virgin, that is near unto him, who hath had no husband, for her may he make himself unclean. read more.
He shall not make himself unclean who is a chief among his peoples, to profane himself. They shall not make any baldness upon their head, neither shall they shave off the corners of their beard, nor make any cuttings in their flesh. They shall be holy unto their God, and not profane the name of their God; for they present Jehovah's offerings by fire, the bread of their God; therefore shall they be holy.

Neither shall he come near any person dead, nor make himself unclean for his father and for his mother; neither shall he go out of the sanctuary, nor profane the sanctuary of his God; for the consecration of the anointing oil of his God is upon him: I am Jehovah.