He must not go near any dead body; he must not make himself unclean, even for his father or his mother.
In context
9If a priest’s daughter defiles herself by becoming a prostitute, she profanes her father; she is to be burned in the fire. 10The high priest, the one among his brothers on whose head the anointing oil has been poured and who has been ordained to wear the priestly garments, must not let his hair hang loose or tear his clothes. 11He must not go near any dead body; he must not make himself unclean, even for his father or his mother. 12He must not leave the sanctuary or profane the sanctuary of his God, because he has been dedicated with the anointing oil of his God. I am Yahweh. 13He is to marry a woman who is still a virgin.