Kabbalah sur Isaïe 1:15

Rav stated: 'A man who willfully causes erection should be placed under the ban'. But why did he not say, 'This is forbidden'? Because the man merely incites his evil inclination against himself. Rav Ami, however, stated: He is called a renegade, because such is the art of the evil inclination: today it incites man to do one wrong thing, and tomorrow it incites him to worship idols and he proceeds to worship them. There are others who say that Rav Ami stated, He who excites himself by lustful thoughts will not be allowed to enter the division of the Holy One, blessed be He. For here it is written, “was evil in the eyes of Hashem" (Genesis 38:7), and elsewhere it is written, “For You are not El who has pleasure in wickedness; nor shall evil dwell with you” (Tehilim 5:5). Rav Elazar stated: Who are referred to in the Scriptural text, “Your hands are full of blood” (Isaiah 1:15)? Those that commit masturbation with their hands. It was taught at the school of Rabbi Yishmael, ‘Thou shalt not commit adultery’ implies, Thou shalt not practice masturbation either with hand or with foot. Our Rabbis taught: 'proselytes and those that play with children delay the advent of the Messiah', meaning: Those that marry minors who are not capable of bearing children, for Rav Yosi stated: The Son of David will not come until all the souls in Guf (Lit. 'Body' the region inhabited by the souls of the unborn) will have been disposed of, since it says, “For the spirit that humbles itself is from Me, and the souls which I have made” (Isaiah 57:16).

Therefore, the Zohar explains that there is no sin that defiles man like the sin of wasting sperm, and this is what it says (Vayeshev): 182. Come and behold: of all the sins that defile a man in this world, that which defiles him the most in this world and in the World to Come is spilling his semen in vain. Letting it out in vain by the hand or leg brings impurity on man, as it is written: “For you are not an El that has pleasure in wickedness: nor shall evil dwell with You” (Tehilim 5:5). 183. He therefore does not come inside the curtain OF THE HOLY ONE, BLESSED BE HE, or behold the presence of Atik Yomin, as is learned from the verses: “Nor shall evil dwell with You,” and “And Er, Judah’s firstborn, was wicked in the sight of Hashem” (Beresheet 38:7). BOTH VERSES INDICATE THAT HE DOES NOT BEHOLD THE FACE OF HASHEM. Hence, it is written: “Your hands are full of blood” (Yeshayah 1:15), WHICH REFERS TO LETTING SEMEN BY THE HAND, WHICH IS LIKENED TO SHEDDING BLOOD. Happy is the portion of the man who fears Hashem and is guarded from the evil path, and purifies himself to be occupied in the fear of his Master.