Rashi on Leviticus 18:6/רש"י על ויקרא י״ח:ו׳

1לא תקרבו NONE OF YOU SHALL APPROACH TO [ANY THAT IS NEAR OF KIN TO HIM] — The intention is to admonish women as well as men (in respect to this general prohibition of unchastity); on this account the plural is used (Sifra, Acharei Mot, Chapter 13 1).

2'אני ה I AM THE LORD, who am faithful to pay you your reward (Sifra, Acharei Mot, Chapter 13 13.