Peri Tzadik, Mishpatim 7:1פרי צדיק, משפטים ז׳:א׳
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Yismach Moshe, Mishpatim 23:1ישמח משה, משפטים כ״ג:א׳
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Maor VaShemesh, Mishpatim 6מאור ושמש, משפטים ו׳
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Zohar, Chayei Sara 21:219ספר הזהר, חיי שרה כ״א:רי״ט
Rabbi Elazar opened with the verse, "Open you my eyes, that I may behold wondrous things out of Your Torah" (Tehilim 119:17). How foolish men are, for they do not know, and do not seek to be occupied with, Torah. Torah is the whole life. All freedom and all goodness in this world and in the World to Come are contained within it. It is life in this world; namely, they may merit full days in this world, as it is written, "The number of your days I will fulfill" (Shemot 23:26). And one will merit long days in the World to Come, for this whole life is a life of joy, life without sadness, life that is real life, freedom in this world, freedom from everything, because other nations cannot rule over anyone who is engaged in the study of Torah.
Rosh Hashanah 11a:12ראש השנה י״א א:י״ב
The Gemara continues: The one who said that in Nisan the Patriarchs were born also holds that in Nisan they died. The one who says that in Tishrei they were born also holds that in Tishrei they died, as it is stated about Moses on the day of his death: “And he said to them: I am one hundred and twenty years old today” (Deuteronomy 31:2). As there is no need for the verse to state “today,” since it is clear that Moses was speaking on that day, what is the meaning when the verse states “today”? It is to teach that Moses was speaking precisely, as if to say: Today my days and years are exactly filled and completed. This comes to teach you that the Holy One, Blessed be He, sits and fills the years of the righteous from day to day and from month to month, as it is stated: “The number of your days I will fulfill” (Exodus 23:26). Similarly, the Patriarchs merited that their years be fulfilled to the day, and so they died on the same date they were born.