He shall not make himself unclean for his father or for his mother, for his brother or for his sister, when they die, because his consecration to God is on his head.
They shall not go to a dead person to defile themselves; however, for father, for mother, for son, for daughter, for brother, or for a sister who has not had a husband, they may defile themselves.
But there were some men who were unclean because of contact with a dead person, so that they could not celebrate Passover on that day; and they came before Moses and Aaron on that day.