Leviticus 21:1-3

¹And the Lord said to Moses, Speak thou to the priests, the sons of Aaron, and thou shalt say to them, A priest be not defouled in the dead men of his citizens (or A priest shall not be defiled with the dead among his fellow citizens),

²no but only in his kinsmen, and nigh of blood, that is, on father, and mother, and son, and daughter, and brother, (only with his own relatives, and next of kin, that is, with his father, and mother, and son, and daughter, and brother,)

³and sister, (who is) a virgin, that is not wedded to man;