Thematic Bible: The duties of a priest

And Jehovah said unto Moses, Speak unto the priests, the sons of Aaron, and say unto them, There shall none defile himself for the dead among his people; except for his kin, that 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, that hath had no husband; for her may he defile himself. read more.
He shall not defile himself, being a chief man among his people, to profane himself. 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. They shall be holy unto their God, and not profane the name of their God; for the offerings of Jehovah made by fire, the bread of their God, they do offer: therefore they shall be holy. They shall not take a woman that is a harlot, or profane; neither shall they take a woman put away from her husband: for he is holy unto his God. Thou shalt sanctify him therefore; for he offereth the bread of thy God: he shall be holy unto thee: for I Jehovah, who sanctify you, am holy. And the daughter of any priest, if she profane herself by playing the harlot, she profaneth her father: she shall be burnt with fire. And he that is the high priest among his brethren, upon whose head the anointing oil is poured, and that is consecrated to put on the garments, shall not let the hair of his head go loose, nor rend his clothes; neither shall he go in to any dead body, nor defile himself for his father, or for his mother; neither shall he go out of the sanctuary, nor profane the sanctuary of his God; for the crown 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 one divorced, or a profane woman, a harlot, these shall he not take: but a virgin of his own people shall he take to wife. And he shall not profane his seed among his people: for I am Jehovah who sanctifieth him.

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