Leviticus 21:6-8

6They shall be holy to their God and not profane the name of their God, for they offer the offerings of the Lord made by fire, and the bread of their God; therefore they shall be holy.

7They shall not take a wife who is a harlot or a defiled woman, nor shall they take a woman divorced from her husband; for the priest is holy to his God.

8Therefore you shall consecrate him, for he offers the bread of your God. He shall be holy to you, for I the Lord, who sanctify you, am holy.