Zohar: Desiring Others
393. "You shall not uncover the nakedness of mother and daughter" (Vayikra 18:17). We have learned that these kinds of sexual misconduct are among the laws of the Queen, even though they are both revealed and hidden. There are listed "her son's daughter, or her daughter's daughter" (Ibid.), for the world needs them to populate the world, as we have learned. One who reveals one nakedness of these, woe to him and woe to his soul, as because of this he will uncover other nakednesses.
394. We have learned the last statement of the Ten Commandments of the Torah, reads, "You shall not covet your neighbor's wife" (Shemot 20:14), as this generally represents the whole of them. He who covets another woman is considered transgressing the entire Torah. However, nothing stands before repentance, all the more so if he is willing to accept upon himself his penalty like King David. Rabbi Yosi said: We have learned that repentance does much good to whoever has sinned and then parted from the sin. If he does not PART FROM IT, repentance does not help and is to no avail. He questions: "How was it that David did not part from Batsheba afterwards?" He replied: "Batsheba was his. He took what was his..."