Musar su Salmi 12:4

There is yet another general tikkun distinctive for the trait of lashon hara, and that is Torah study, as stated in Arachin 15b: "R. Chamma b. R. Chanina said: 'What is the amendment for the speakers of lashon hara? If he is a Torah scholar, let him occupy himself with Torah, as it is written (Proverbs 15:4): 'The healer of the tongue is the tree of life,' and the tree of life is none other than Torah, as it is written (Ibid. 3:18): 'It [Torah] is a tree of life to those who hold fast to it.'" As to its being called "a tree of life" — "Death and life are in the hand of the tongue" (Ibid. 18:21). If so, one who speaks lashon hara acquires for himself eternal death, wherefore Scripture counseled one who wished to heal his tongue to eat from the tree of life, which is Torah, "and he shall eat [thereof] and live forever."

38. The true believer only condescends to flatter when he pursues wisdom.

And secondly, for this [too] is one who speaks evil speech considered as if he denied a fundamental principle: For he says in his heart that his lips are in his [own] control; and because they do not do an action and he is in charge of his tongue, he determined in his heart that he should not restrain the spirit of his lips from saying that which comes to his spirit; and that only all the other limbs are not in his control to sin with them - like the matter that is stated (Psalms 12:5), “They say, “with lips such as ours, who can be our master?” And they do not say, “Where is the God that made me, to whom all the movements of His creations are given - not one is lacking. They are all subjected to doing His will. Rather, it is no matter - the petitions about the lips are in our control.” The evildoers that sin with other sins are not like this. For they know that their leaving God is bad and bitter, however they were pulled after their desire and their overpowering [evil] impulse; yet they are pained by this. And our Rabbis said (Arakhin 15b), “Evil speech [...] corresponds to three transgressions [and these are them]: Idol worship, forbidden sexual relations and bloodshed. [...] With regard to idol worship, it is stated (Exodus 32:31), ‘Oh, this people have sinned a great sin.’ With regard to forbidden sexual relations, it is stated (Genesis 39:9), ‘How can I do this great wickedness.’ With regard to bloodshed it is stated (Genesis 4:13), ‘My punishment is greater than I can bear.’ [And with regard to evil speech,] it is stated (Psalms 12:4), “May the Lord cut off all flattering lips, the tongue that speaks great things.”