Numbers 6:7
He shall not make himself unclean for his father, or for his mother, or for his brother, or for his sister, when they die, because his separation to his God is upon his head.
Numbers 9:6
And there were certain men who were defiled by the dead body of a man, so that they could not prepare the Passover on that day. And they came before Moses and before Aaron on that day.
Leviticus 21:1-2
And Jehovah said to Moses, Speak to the priests, the sons of Aaron, and say to them, There shall none be defiled for the dead among his people.
Leviticus 21:10-12
And the high priest among his brothers, on whose head the anointing oil was poured and who is consecrated to put on the garments, shall not uncover his head nor tear his clothes.
Ezekiel 44:25
And he shall not come near any dead person to defile himself; but they may defile themselves for father, or for mother, or for son, or for daughter, for brother, or for sister who has had no husband.