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; for the consecration of his God is upon his head.
Numbers 9:6
And there were men, who were unclean through the dead body of a man, and could not hold 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 unto the priests, the sons of Aaron, and say unto them, There shall none make himself unclean for a dead person among his peoples,
Leviticus 21:10-12
And the high priest among his brethren, on whose head the anointing oil was poured, and who is consecrated to put on the garments, shall not uncover his head, nor rend his garments.
Ezekiel 44:25
And they shall come at no dead person to become unclean; but for father, or for mother, or for son, or for daughter, for brother, or for sister that hath had no husband, they may become unclean.