Even if their own father, mother, brother, or sister dies, they must not make themselves unclean by going near them. Nazarites show their vow to God with their long hair.
“ ‘A priest must not make himself unclean by going near a dead body. But a priest may become unclean if the dead person is his father, mother, son, daughter, brother, or unmarried sister.
But there were some men who had become unclean from touching a dead body, and they couldn’t celebrate the Passover that day. They came to Moses and Aaron