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 separation to God is on his head.
They shall go in to no dead person to defile themselves; but for father, or for mother, or for son, or for daughter, for brother, or for sister who has had no husband, they may defile themselves.
There were certain men, who were unclean because of the dead body of a man, so that they could not keep the Pesach on that day, and they came before Moshe and before Aharon on that day.