Musar zu Schemot 2:13

And there are some [negative commandments] that some of the masses do not keep the main [negative commandment], such as wounding and hitting. For one that hits his fellow violates two negative commandments, as it is stated (Deuteronomy 25:3), “You shall strike him forty; you shall not add, lest you add.” And many transgress these negative commandments by hitting their wives. And our Rabbis, may their memory be blessed, said (Sanhedrin 58b), “Anyone who raises his hand to strike another, even if he does not strike him, is called wicked - as it is stated (Exodus 2:13), ‘and he said to the wicked one, “Why should you strike your friend?”’ ‘Why did you strike,’ is not stated, but rather, ‘should you strike.’” And Job said (Job 31:21), “If I raised my hand against the fatherless.” And our Rabbis, may their memory be blessed, said (Sanhedrin 58b) [that] Rav Huna would cut off the hand of the striker. He would say, “And the high arm shall be broken” (Job 38:15).

The seventeenth thing to remember is that it is a very good quality to keep away from people when he can save himself from them, and sit in his room alone. For most transgressions are committed by two or more — for example, fornication, gossip, lies and flattery — and from all of these he who sits alone is saved for he will not vaunt himself over any man and he will not hear their idle talk. For when he stays with them he is obliged to rebuke them in three ways : either by striking the offender, as Phinehas did when he took the javelin in his hand (Num. 25:7); or with words, as Moses our Teacher did, when he said to the wicked man, "Wherefore smitest thou thy fellow?" (Ex. 2:13); or in one's heart, as David said, "I hate the gathering of evil-doers, and will not sit with the wicked" (Ps. 26:5). And who can constantly keep quarreling with such people, inasmuch as they constantly transgress? But when you sit alone you avoid all this guilt and you are saved from many transgressions. But pious people one should join and one should sit near them and learn from them, as it is written, "He that walketh with wise men shall be wise" (Prov. 13:20).

Datan and Aviram accused Moses and Aaron of misleading the people when they said in 16,14: "should you gouge out those men's eyes? we will not come!" These words alluded to a metaphysical dimension, that Korach was the reincarnation of Cain. All our commentators say that when Moses slew the Egyptian (who was part of Cain's reincarnation as we have explained), it was Datan and Aviram who told on him and who made an issue of Moses' taking the law into his own hands, etc. (Exodus 2, 13/14). Now they concentrated on their greed for money. This was because, according to tradition, they had become impoverished as a result of having reported Moses' action to Pharaoh. When Moses had been bidden to return to Egypt the Torah said that all the people who had sought his death had already died (Exodus 4,19). Since Datan and Aviram were obviously still "alive," this meant that they had lost their influence to cause harm, since "poor people, childless people, leprous people, and blind people are considered dead people" (Zohar Beha-alotcha 153, Nedarim 64). Our sages also say that while in Egypt both Datan and Aviram were childless, and not like the other Jews who had been blessed with an abundance of children. They now lost the children they had fathered since the Exodus, due to their rebellious behaviour. It is almost certain that they were afflicted with צרעת, seeing that this is the standard penalty for malicious gossip, something they had certainly been guilty of. Even if their bodies had not been afflicted by that disease, certainly their souls had become afflicted by it. The Zohar explains Proverbs 21,23, "He who guards his mouth and tongue guards his soul from troubles," i.e. מצרות נפשו. He says we should read instead מצרעת נפשו, from afflicting his soul with "leprosy." By sarcastically asking: "Are you going to gouge out the eyes of these men, etc.?" Datan and Aviram described a method of "death" of someone who is compared to the dead since he does not possess eyesight. This explains Rashi's comment on Exodus 4,19, where he quotes Nedarim 64 that the poor are considered as if dead. Their sin consisted of greed, the opposite of the virtue of enjoying one's share, which is the true wealth.