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 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 come at 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.