Thematic Bible: Not to defile themselves for the dead except the nearest of kin

The Lord said to Moses, Speak to the priests [exclusive of the high priest], the sons of Aaron, and say to them that none of them shall defile himself for the dead among his people [by touching a corpse or assisting in preparing it for burial], Except for his near [blood] kin, for his mother, father, son, daughter, brother, And for his sister, a virgin, who is near to him because she has had no husband; for her he may be defiled. read more.
He shall not even defile himself, being a [bereaved] husband [his wife not being his blood kin] or being a chief man among his people, and so profane himself. The priests [like the other Israelite men] shall not shave the crown of their heads or clip off the corners of their beard or make any cuttings in their flesh. They shall be holy to their God and not profane the name of their God; for they offer the offerings made by fire to the Lord, the bread of their God; therefore they shall be holy.