Берешит 25:12 Мидраш: Midrash Tanchuma Buber, Bamidbar Rabbah, Sefer HaYashar (midrash) & Midrash Tanchuma

וְאֵ֛לֶּה תֹּלְדֹ֥ת יִשְׁמָעֵ֖אל בֶּן־אַבְרָהָ֑ם אֲשֶׁ֨ר יָלְדָ֜ה הָגָ֧ר הַמִּצְרִ֛ית שִׁפְחַ֥ת שָׂרָ֖ה לְאַבְרָהָֽם׃

Теперь это поколения Измаила, Авраама'Сын, которого Агарь Египетская, Сара'служанка, родила Аврааму.

Midrash Tanchuma Buber

(Gen. 25:19:) THESE ARE THE GENERATIONS OF ISAAC BEN ABRAHAM.1Except for most of the last section (# 24), Toledot is not found in Buber’s Oxford MS. Buber has filled in the gap mostly from Codex Vaticanus Ebr. 34. This text is related (to Prov. 17:6): GRANDCHILDREN ARE A CROWN FOR ELDERS, AND THE GLORY OF CHILDREN IS THEIR PARENTS.2Cf. Gen. R. 63:2; Tanh., Gen. 6:4. Who caused Abraham to be magnified? Jacob, as stated (in Is. 29:22): THUS SAYS THE LORD UNTO THE HOUSE OF JACOB, WHICH REDEEMED ABRAHAM. Why? Because, if one is meritorious as a Torah scholar together with his son and his grandson, it will never again be cut off from him. Thus it is stated (in Deut. 4:9f.): AND MAKE THEM (the statutes and ordinances) KNOWN TO YOUR CHILDREN AND GRANDCHILDREN AS ON THE DAY THAT YOU STOOD < BEFORE THE LORD YOUR GOD AT HOREB >. Just as the gift of < the > Torah did not become cease on the day it was given; so for one who teaches his son and his grandson Torah, it shall never again depart from him. And so it was when the Holy One saw Abraham was busy with the Torah. Where is it shown? Where it is stated (in Gen. 26:5): BECAUSE ABRAHAM HEEDED MY VOICE < AND KEPT MY CHARGE: MY COMMANDMENTS, MY STATUTES, AND MY LAWS >. It is also written (above, in 18:19): FOR I HAVE KNOWN HIM. Then Jacob arose up and did not move from the Torah, as stated (in Gen. 25:27): BUT JACOB WAS A PERFECT MAN WHO SAT IN THE TENTS (i.e., in the academies).3For this interpretation, see Gen. R. 63:10; Targum Onqelos, Gen. 25:27; PRK 5:7. What stipulation did the Holy One make with them? (According to Josh. 1:8:) < THIS > BOOK OF THE LAW SHALL NOT DEPART < FROM YOUR MOUTH >…. It is also written (in Prov. 10:1): A WISE SON SHALL MAKE A FATHER GLAD. This is Isaac, since it is stated (in Gen. 21:12): FOR IN ISAAC SHALL YOUR SEED BE NAMED. (Prov. 10:1, cont.:) BUT A FOOLISH SON. This is Ishmael. Thus it is written (in Gen. 25:12): NOW THESE ARE THE GENERATIONS OF ISHMAEL BEN ABRAHAM. There are children who suffer disgrace through their parents. Josiah suffered disgrace through his father, as stated (in II Chron. 33:23): FOR AMON INCURRED A LOT OF GUILT. Hezekiah suffered disgrace through < his father > Ahaz, as stated (in Is. 8:16): BIND UP THE TESTIMONY.4According to Gen. R. 42:3; Lev. R. 11:7; Ruth R., proem 7; and Esther R., proem 11, this verse alludes to Ahaz, who had seized (ahaz) the synagogues and the academies. There are also parents who suffer disgrace through their children. Eli suffered disgrace through his sons, [as stated (in I Sam. 2:12): NOW ELI'S SONS WERE SCOUNDRELS. And Samuel also suffered disgrace through his sons], as stated (in I Sam. 8:3): BUT HIS SONS DID NOT WALK IN HIS WAYS. It did not, however, turn out in this way for Abraham. Instead he was magnified through Isaac, as stated (in Gen. 25:19, cont.): ABRAHAM SIRED ISAAC. Did he sire no one but Isaac? Now look, it is written {(in Gen. 25:19): THESE ARE THE GENERATIONS OF ISHMAEL.} [(in Gen. 16:15): SO HAGAR BORE A SON TO ABRAM.] And in addition < there are > the sons of Keturah: Zimran and Jokshan, < etc. > (cf. Gen. 25:2). But it does not say that Abraham sired anyone but Isaac, simply because Isaac was righteous. It is therefore stated (in Gen. 25:19): ABRAHAM SIRED ISAAC.

Bamidbar Rabbah

And these are the generations of Aaron and Moses on the day that God spoke to Moses on Mount Sinai (Numbers 3:1).
Anyone with whom the Omnipresent engages to establish a nation or a family tree from him, the Omnipresent would also engage with him to write generations in his regard, as you find twelve instances of generations in the verses. The first: “These are the generations of the heavens and the earth” (Genesis 2:4); “this is the book of the generations of Adam” (Genesis 5:1); “these are the generations of Noah” (Genesis 6:9); “these are the generations of the sons of Noah” (Genesis 10:1): “these are the generations of Shem” (Genesis 11:10); “these are the generations of Teraḥ” (Genesis 11:27); “these are the generations of Ishmael” (Genesis 25:12); “Isaac” (Genesis 25:19); “Esau” (Genesis 36:1); “Jacob” (Genesis 37:2). These are ten generations with which the Holy One blessed be He engaged to create the world and to establish nations. And there are two people that the Omnipresent wrote their generationst, one for the royal dynasty and one for the priestly dynasty: “These are the generations of Peretz” (Ruth 4:18), to establish the royal dynasty from him, and “these are the generations of Aaron and Moses"(Numbers 3:1), for the priestly dynasty.

Sefer HaYashar (midrash)

and Ishmael took his children and all the property that he had gained, together with the souls ‎of his household and all belonging to him, and they went to locate where they should find a ‎suitable place, And they went and dwelt near the wilderness of Paran and their dwelling was ‎from Havilah unto Shur, that is before Egypt as thou comest toward Assyria; and Ishmael and ‎his sons dwelt in the land, and they had chidren born unto them, and they were fruitful and ‎increased greatly. And these are the names of the sons of Nebayoth, the first born of Ishmael: ‎Mend, and Send, and Mayon; and the sons of Kedar were: Alyon, and Kezem, and Chamad, ‎and Eli. And the sons of Adbeel were: Cha mad, and Jabin; and the sons of Mibsam were: ‎Obadiah, and Ebedmelech, and Yeush—these are the families of the children of Ribah, the ‎wife of Ishmael; and the sons of Mishma, the son of Ishmael, were: Shamua, and Zecaryon, ‎and Obed; and the sons of Dumah were: Kezed, and Eli, and Machmad, and Amed; and the ‎sons of Masa were: Melon, and Mula, and Ebidadon; and the sons of Chadad were: Azur, and ‎Minzar, and Ebed melech; and the sons of Tema were: Seir, and Sadon, and Yakol; and the ‎sons of Yetur were: Merith, and Yaish, and Alyo, and Pachoth; and the sons of Naphish were: ‎Ebed, and Tamed, and Abiyasaph, and Mir; and the sons of Kedma were: Calip, and Tachti, and ‎Omir—these were the children of Malchuth, the wife of Ishmael, according to their families. ‎All these are the families of Ishmael according to their generations, and they dwelt in those ‎lands wherein they had built themselves cities unto this day.‎ And Rebekah, the daughter of Bethuel, the wife of Isaac, Abraham’s son, was barren in those ‎days, she had no offspring. And Isaac dwelt with his father in the land of Canaan, and the Lord ‎was with Isaac; and Arpachshad, son of Shem, the son of Noah, died at that time, in forty-‎eighth year of Isaac’s life; and all the days of Arpachshad’s life were four hundred and thirty ‎years when he died.‎