Thematic Bible: Mourning for the dead

Then the LORD said to Moses, "Speak to the priests, the sons of Aaron, and say to them: 'No one shall defile himself for a dead person among his people, except for his relatives who are nearest to him, his mother and his father and his son and his daughter and his brother, also for his virgin sister, who is near to him because she has had no husband; for her he may defile himself.