Musar untuk Yesaya 57:5

However, I came to explain further the anger and wrath over the severity of the great sin of wasting seed. It is stated in Tractate Niddah, beginning of Chapter 20 (13a): "It was taught in a baraita: Rabbi Eliezer says: Anyone who holds his male organ and urinates is considered as though he brought a flood upon the world." They said to Rabbi Eliezer: But doesn't seminal drops drip onto his feet, appearing like one who cuts off his own flesh? And it turns out that he speaks disparagingly about his children, who are mamzerim (illegitimate offspring). He said to them: It is better that he should speak disparagingly about his children, who are mamzerim, and not make himself wicked for even one moment before the Omnipresent. And we say: For what reason does the verse state this? Because he emits semen wastefully, as Rabbi Yoḥanan says: Anyone who emits semen wastefully is liable to receive the death penalty, as it is stated: “And it was evil in the eyes of the Lord that which he did; and he also died” (Genesis 38:10). Rabbi Yitzḥak and Rabbi Ami say: It is as though he sheds blood, as it is stated: “Who comfort you with idols under every leafy tree, slaying the children in the valleys” (Isaiah 57:5). Do not read it as slaying [shoḥtei], but rather as squeezing [soḥtei]. Rav Ashi says: It is as though he worshiped idols, as here it is written: “Under every leafy tree,” and there it is written: “Upon the high mountains, and upon the hills, and under every leafy tree” (Deuteronomy 12:2).

And one who plays with children and [masturbates] whether with the hand or the foot is liable. And our Rabbis, may their memory be blessed, said (Niddah 13b) that his punishment is like the punishment of the generation of the flood, that had corrupted their ways. And likewise one who does like the act of Er and Onan - to thresh (the penis) inside (the vagina) and winnow outside, to destroy the seed - is liable, as it is stated (Genesis 38:10), “And what he did was displeasing to the Lord, and He killed him as well.” And it is stated about those that waste seed (Isaiah 57:5), “You who inflame yourselves among the terebinths, under every verdant tree; who slaughter children, etc.”