Leviticus 21:7-9

7They are not to marry a woman defiled by prostitution. They are not to marry one divorced by her husband, for the priest is holy to his God.

8You are to consider him holy since he presents the food of your God. He will be holy to you because I, the Lord who sets you apart, am holy.

9If a priest’s daughter defiles herself by promiscuity, she defiles her father; she must be burned to death.