Leviticus 21:1-2

Young's Literal Translation

21 And Jehovah saith unto Moses, `Speak unto the priests, sons of Aaron, and thou hast said unto them, For [any] person [a priest] is not defiled among his people,

² except for his relation who [is] near unto him -- for his mother, and for his father, and for his son, and for his daughter, and for his brother.