Leviticus 21:1-3

Amplified Bible, Classic Edition

21 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],

² Except for his near [blood] kin, for his mother, father, son, daughter, brother,

³ And for his sister, a virgin, who is near to him because she has had no husband; for her he may be defiled.