Берешит 49:31 Мидраш: Sifra, Vayikra Rabbah & Sifrei Devarim

8) This tells me only of the patriarchs. Whence do I derive (the same for) the matriarchs? From (the triple) eth, eth, eth, "eth" signifying the matriarchs, viz. (Bereshith 49:31), "There they buried Avraham and ('ve'eth') Sarah his wife." And whence is it derived that a covenant has been made with the land? From "and the land will I remember" (as I remember the covenant with the patriarchs.)

Why are the patriarchs mentioned in reverse order? It is to say that if there, the deeds of Jacob would have been insufficient, the deeds of Isaac would be sufficient. If the deeds of Isaac would be insufficient, the deeds of Abraham would be sufficient. The deeds of each and every one of them is sufficient for the world to maintained on his account.
Why is remembrance stated regarding Jacob and Abraham, but regarding Isaac it is not stated? Rabbi Berekhya and the Rabbis, Rabbi Berekhya said: It is because he was one who experienced suffering. The Rabbis say: [God] sees the ashes of Isaac as though they are piled atop the altar.²⁰This obviates the need for remembrance.
Why is “also” stated regarding Abraham and Isaac, but “also” is not stated regarding Jacob?²¹Because Jacob was stated first, there was no need to employ the word “also” in his regard. The implication is that God primarily remembers His covenant with Jacob, and also, secondarily, He remembers His covenant with Abraham and Isaac. It is because his bed was complete before him. Ishmael and all the children of Ketura emerged from Abraham. Esau and all the chieftains of Edom emerged from Isaac. But Jacob, his bed was complete; all his sons were righteous. That is what is written: “We are all the sons of one man” (Genesis 42:11). I have only the patriarchs, from where do I derive the matriarchs?²²The verse states that God will remember His covenant with the patriarchs and Israel will gain from their merit; from where is it derived that the same is true of the matriarchs? The verse states: Et…et…et.²³The verse uses the word et, which does not have an English equivalent, when it mentions each of the patriarchs. These words, which are not essential to the verse, are understood to be alluding to the wives of the patriarchs. Et refers only to the matriarchs, as it is written: “There they buried Abraham and [ve’et] Sarah, his wife; there they buried Isaac and [ve’et] Rebecca, his wife and there I buried [et] Leah” (Genesis 49:31).
Why does it mention the merit of the patriarchs and mention the merit of the Land with them? Reish Lakish said: This is analogous to a king who had three sons, and one of his maidservants was raising them. Any time the king would inquire after the welfare of his sons, he would say: ‘Inquire for me after the welfare of the one raising them.’ So, any time the Holy One blessed be He mentions the patriarchs, He mentions the Land with them. That is what is written: “I will remember My covenant with Jacob…and the Land I will remember.”

(Ibid. 5) "And Moses died there": Is it possible that Moses died and wrote "And Moses died there!" But up to this point, Moses wrote; from this point on, Joshua wrote. These are the words of R. Yehudah. (Others say, R. Nehemiah) R. Shimon said to him: Is it not written (Ibid. 31:26) "Take this Torah scroll and place it at the side of the ark, etc."? It must be, then, that Moses wrote in tears what the Holy One Blessed be He told him to write, as in (Jeremiah 36:18) "And Baruch said to them: With his mouth did he utter to me all of these words, and I wrote them in the book in ink." R. Eliezer says: A Heavenly voice called out (for a distance of) twelve mils by twelve mils "And Moses died." S'malyon said (It called out) "And Moses died there, the great scribe of Israel." Whence is it derived that a tunnel issues from the grave of Moses to that of the patriarchs? It is written here "and Moses died there," and elsewhere, (Bereshith 49:31) "There they buried Abraham and Sarah his wife." Others say: "Moses did not die, but he stands and serves, it being written here "there," and elsewhere (Shemoth 34:28) "And he (Moses) remained there with the L-rd." Just as there, standing and serving, so, here, standing and serving.