The nakedness of thy father’s wife shalt thou not uncover; it is thy father’s nakedness.

And you may not have sex relations with your father's wife: she is your father's.

Ασχημοσυνην γυναικος του πατρος σου δεν θελεις αποκαλυψει· ειναι ασχημοσυνη του πατρος σου.

The nakedness of thy father’s wife shalt thou not uncover: it is thy father’s nakedness.