Numbers 6:7
He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die: because the consecration of his God is upon his head.
Numbers 9:6
And there were certain men, who were defiled by the dead body of a man, that they could not keep the passover on that day: and they came before Moses and before Aaron on that day:
Leviticus 21:1-2
And the LORD 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 he that is the high priest among his brethren, upon whose head the anointing oil was poured, and that is consecrated to put on the garments, shall not uncover his head, nor rend his clothes;
Ezekiel 44:25
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.