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.
(יא) וַיְהִ֣י ׀ בַּיָּמִ֣ים הָהֵ֗ם וַיִּגְדַּ֤ל מֹשֶׁה֙ וַיֵּצֵ֣א אֶל־אֶחָ֔יו וַיַּ֖רְא בְּסִבְלֹתָ֑ם וַיַּרְא֙ אִ֣ישׁ מִצְרִ֔י מַכֶּ֥ה אִישׁ־עִבְרִ֖י מֵאֶחָֽיו׃
(11) Some time after that, when Moses had grown up, he went out to his kinsfolk and witnessed suffering . He saw an Egyptian beating a Hebrew, one of his kinsmen.
(כט) וַיָּ֥זֶד יַעֲקֹ֖ב נָזִ֑יד וַיָּבֹ֥א עֵשָׂ֛ו מִן־הַשָּׂדֶ֖ה וְה֥וּא עָיֵֽף׃ (ל) וַיֹּ֨אמֶר עֵשָׂ֜ו אֶֽל־יַעֲקֹ֗ב הַלְעִיטֵ֤נִי נָא֙ מִן־הָאָדֹ֤ם הָאָדֹם֙ הַזֶּ֔ה כִּ֥י עָיֵ֖ף אָנֹ֑כִי עַל־כֵּ֥ן קָרָֽא־שְׁמ֖וֹ אֱדֽוֹם׃
(29) Once when Jacob was cooking a stew, Esau came in from the open, famished. (30) And Esau said to Jacob, “Give me some of that red stuff to gulp down, for I am famished”—which is why he was named Edom.
..לְיָמִים נִזְדַּוְּוגוּ שְׁלָשְׁתָּן לִמְקוֹם אֶחָד, אָמְרוּ: קַפְּדָנוּתוֹ שֶׁל שַׁמַּאי בִּקְּשָׁה לְטוֹרְדֵנוּ מִן הָעוֹלָם, עִנְוְותָנוּתוֹ שֶׁל הִלֵּל קֵרְבַתְנוּ תַּחַת כַּנְפֵי הַשְּׁכִינָה.
....The Gemara relates: Eventually, the three converts gathered together in one place, and they said: Shammai’s impatience sought to drive us from the world; Hillel’s patience brought us beneath the wings of the Divine Presence.