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 unto God is upon his head.
And there were certain men, who were unclean by reason of the dead body of a man, so that they could not keep the passover on that day: and they came before Moses and before Aaron on that day:
And 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 that hath had no husband, they may defile themselves.