Musar su Salmi 13:4

And so, with the man of lashon hara. When his evil nature is revealed, all hate him, and guard themselves from him, lest he make them objects of shame and humiliation. And even if he merits rising for the resurrection, he will be like an absolute mute. As Chazal have said (Devarim Rabbah 6): "The Holy One Blessed be He is destined to cut off the tongues of the men of lashon hara, as it is written (Psalms 13:4): 'The L-rd will cut off all "smooth" lips, the tongue that speaks boastful things.'" The reference is to the time of the resurrection. Who can fathom the greatness of the suffering of that man and his eternal shame! For then all will know the nature of that man, that he was an evildoer, who, with his smooth lips stirred up hatred between man and his friend, as Scripture states (Koheleth 12:13): "The end of the thing, all is heard," which Onkelos translates: "All the deeds of men are destined to be revealed, etc." For this reason [i.e., that he was a man of lashon hara] this punishment came upon him, that all men rose living and with their speech intact as of yore, and this man, as an absolute mute. From this a man can reflect upon the gravity of the sin, which reaches to his very soul in this world and the next.