Numbers 6:7

Christian Standard Bible

He is not to defile himself for his father or mother, or his brother or sister, when they die, while the mark of consecration to his God is on his head.

Cross References

Numbers 9:6

But there were some men who were unclean because of a human corpse, so they could not observe the Passover on that day.  These men came before Moses and Aaron the same day

Ezekiel 44:25

A priest may not come near a dead person so that he becomes defiled.  However, he may defile himself for a father, a mother, a son, a daughter, a brother, or an unmarried sister.

Numbers 6:8

He is holy to the Lord   during the time of consecration.