Thematic Bible: The duties of a priest

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. They shall not take as wife a whore, or a dishonoured woman; neither shall they take a woman put away from her husband; for he is holy unto his God. And thou shalt hallow him; for the bread of thy God doth he present: he shall be holy unto thee; for I, Jehovah, who hallow you am holy. And the daughter of any priest, if she profane herself by playing the whore, she profaneth her father: she shall be burned with fire. And the high priest among his brethren, on whose head the anointing oil was poured, and who is consecrated to put on the garments, shall not uncover his head, nor rend his garments. 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. And he shall take a wife in her virginity. A widow, or a divorced woman, or a dishonoured one, a harlot, these shall he not take; but he shall take as wife a virgin from among his peoples. And he shall not profane his seed among his peoples; for I am Jehovah who do hallow him.

And now, ye priests, this commandment is for you. If ye do not hear, and if ye do not lay it to heart, to give glory unto my name, saith Jehovah of hosts, I will even send the curse among you, and I will curse your blessings: yea, I have already cursed them, because ye do not lay it to heart. Behold, I will rebuke your seed, and spread dung upon your faces, the dung of your feasts; and they shall take you away with it. read more.
And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith Jehovah of hosts. My covenant with him was of life and peace, and I gave them to him that he might fear; and he feared me, and trembled before my name. The law of truth was in his mouth, and unrighteousness was not found in his lips: he walked with me in peace and uprightness, and he turned many from iniquity. For the priest's lips should keep knowledge, and at his mouth they seek the law; for he is the messenger of Jehovah of hosts.