Musar su Salmi 135:13

We find a similar incident in Kallah Rabbasi (Chapter 2) in which Rabbi Akiva encountered an evildoer to whom the destroying angels were administering punishment. Rabbi Akiva asked him if he had a son, to which he replied that he did. He also told him where the boy lived. So Rabbi Akiva went to that place and taught the boy to recite the Kaddish. Then the boy responded, Amein, yehei shemeih raba mevorach le’olam ulolmei olmayo, and the evildoer was immediately released from his suffering. Afterwards he appeared to Rabbi Akiva and informed him that he had been freed from his afflictions. Rabbi Akiva then recited the verse, “Hashem, Your remembrance endures throughout the generations!” (Tehillim 135:13).