Kabbalah sa Genesis 17:21: Reshit Chokhmah

It also says “he defiles the land” meaning that he defiles the supernal land. The reason is that the supernal land only receives abundance from the supernal Tzaddik, and the Tzaddik only bestows to her, and when man heats himself up for no reason he causes that the supernal brit (the Tzaddik) will be forced to bestow the supernal good abundance to the external forces. The secret of its establishment (of the brit) in the secret of (Genesis 17:21)“I (God) shall establish My covenant, Isaac”, is by the awakening of Torah and good deeds to bestow to her (Shechinah, Malchut) the supernal white Light. Whilst he is “Bal Keri” (someone who is impure because of the release of sperm) that he is heated by the Lamed Yud Angel and her forces, it is also for waste, and anything wasteful or empty is the external forces like the nations that bow down to nothingness and emptiness. But it turns out that the abundance that was supposed to be received by the mistress (Shechinah, Malchut) is received by the maidservant (the Klippot). As said in Proverbs 30:23 “A maidservant, when she displaces her mistress.” And the mistress receives the left-overs which is the harsh judgment of the left side. Thus, “he defiles the land” and whoever knows the secret of the Supernal Zivug knows how grave this sin is.