Numbers 6:5

“Also, for the duration of the consecration you must not have your hair cut. Your long hair will be a continuing sign of holy separation to God.

^6-7 “Also, for the duration of the consecration to God, you must not go near a corpse. Even if it’s the body of your father or mother, brother or sister, you must not ritually defile yourself because the sign of consecration to God is on your head.