Musar do Izajasza 28:25

And our Rabbis, may their memory be blessed, said (Yoma 87a), “One who angers his friend, verbally must appease him.” And it is not [even] necessary to say [this] if he spoke evil speech about him, for that is from the [more] severe transgressions. And if his fellow does not forgive him, he is obligated to come to him with a group of three people. And if he does not forgive him [again], he comes in front of him a second time with a different group. And so must he do a third time. And Elihu said (Job 33:27), “He should then assemble (yashor) a row of men, and say, I have sinned, and perverted that which was right (yashar), and it was not fitting (shavah) for me.’” The explanation is, I have perverted a just man - from the usage (Job 1:1), “blameless and just man (yashar)” - for I did not see the merit of the just man, but rather made him into one crooked and twisted. But it was not level (shavah) and just for me, from the usage (in Isaiah 28:25), “Is it not if he leveled (shivah) its surface”; [and in] (Genesis 14:17), “to the level (shavah) valley” - [meaning] straight and level. And since he disparaged just ones in front of people, he must humble himself and confess in front of the many. Hence Elihu spoke about this sin in particular, for it is one of the weighty sins that destroys the soul. And our Rabbis, may their memory be blessed, said (Shabbat 119b), “Anyone who disparages Torah scholars cannot be healed from his wound” - for they profaned the Torah - as it is stated (II Chronicles 36:16), “And they mocked the messengers of God, etc., it could not be healed.”