Bible Verses About Defilement: Specially required to avoid

ADONAI said to Moshe, "Speak to the cohanim, the sons of Aharon; tell them: 'No cohen is to make himself unclean for any of his people who dies,

except for his close relatives -his mother, father, son, daughter and brother;

he may also make himself unclean for his virgin sister who has never married and is therefore dependent on him.

He may not make himself unclean, because he is a leader among his people; doing so would profane him.

Cohanim are not to make bald spots on their heads, mar the edges of their beards or cut gashes in their flesh.

Rather, they are to be holy for their God and not profane the name of their God. For they are the ones who present ADONAI with offerings made by fire, the bread of their God; therefore they must be holy.