Leviticus 21:8-11
English Standard Version
Chapter 21
8You shall sanctify him, for he offers the bread of your God. He shall be holy to you, for I, the Lord, who sanctify you, am holy. 9And the daughter of any priest, if she profanes herself by whoring, profanes her father; she shall be burned with fire.
10"The priest who is chief among his brothers, on whose head the anointing oil is poured and who has been consecrated to wear the garments, shall not let the hair of his head hang loose nor tear his clothes.
11He shall not go in to any dead bodies nor make himself unclean, even for his father or for his mother.