Leviticus 21
6 Ref Let them be holy to their God and not make the name of their God common; for the fire offerings of the Lord and the bread of their God are offered by them, and they are to be holy.
7 Ref They may not take as wife a loose or common woman, or one who has been put away by her husband: for the priest is holy to his God.
8 Ref And he is to be holy in your eyes, for by him the bread of your God is offered; he is to be holy in your eyes, for I the Lord, who make you holy, am holy.