Rabbi Perida had a certain student whom he would have to teach four hundred times, and only then would he learn the material, as he was incapable of understanding it otherwise. One day they requested Rabbi Perida’s presence for a mitzva matter after the lesson. Rabbi Perida taught his student four hundred times as usual, but this time the student did not successfully learn the material. Rabbi Perida said to him: What is different now that you are unable to grasp the lesson? He said to him: From the time that they said to the Master that there is a mitzva matter for which he is needed, my mind was distracted from the lesson and every moment I said: Now the Master will get up, now the Master will get up to go and perform the mitzva and he will not complete the lesson. Rabbi Perida said to him: Pay attention this time and I will teach you, and know that I will not leave until you have fully mastered the lesson. He taught him again an additional four hundred times. Due to the merit of Rabbi Perida’s great devotion to his students, a Divine Voice emerged and said to him: Is it preferable to you that four hundred years be added to your life, or that you and the rest of your generation will merit the World-to-Come? He said: I prefer that I and my generation merit the World-to-Come. The Holy One, Blessed be He, said to the angels: Give him both; he shall live a very long life and he and the rest of his generation will merit the World-to-Come.