Musar su Proverbi 24:1

This is one of the things for which a person becomes obligated to leave the group of evildoers. For he will be punished for hearing their evil words and being too listless to answer them. And this is something explicit in the words of Solomon, as it is stated (Proverbs 24:1-2), “Do not envy evil men; do not desire to be with them. For their hearts talk violence, and their lips speak mischief.” And he meant to say [it is] because you will bear the iniquity when they sin. For you will constantly hear their evil words and you will be silent.

The eighth category is he who hears gossip or vile words, or who associates with scoffers and those who shame the Torah and the commandments, and he knows that they are stubborn and that they will not accept rebuke, and therefore is silent. He, too, will be punished, for it is up to him to answer them so they connot say that he is like them and that by his silence he admits the truth of their words. He must scold them in order to ascribe greatness to the Torah and to the commandments and to be zealous for the honor of the righteous man whom they have condemned. And this is one of the circumstances where a man must leave the companionship of the wicked, for he will be punished if he hears their evil words constantly and he cannot answer them. And this matter is explained in the words of Solomon, "Be not thou envious of evil men, neither desire to be with them; for their heart studieth destruction, and their lips talk of mischief" (Prov. 24:1—2). His meaning was that you will bear their sin if you hear their evil words always and hold your peace.