Genesis 22:20

אחרי הדברים האלה AFTER THESE THINGS [IT WAS TOLD ABRAHAM] etc. — When he returned from Mount Moriah Abraham was pondering and he said, “If my son had really been slain, he would have died without children! I must marry him to one of the daughters of Aner or Eshcol or Mamre”. The Holy One, blessed be He, therefore had the announcement made to him that Rebecca, the one fit to be his (Isaac’s) consort, had been born. This is what is meant by “after these things or words” — namely, “after the words” that expressed the thoughts aroused by the Binding of Isaac (Genesis Rabbah 57:3). גם היא SHE ALSO — She also had a number of families equal in all respects to those which Abraham was to have — namely, twelve, and just as in the case of Abraham, of the twelve tribes born of Jacob) eight were the children of the principal wives and four those of the hand-maids, so here, also, eight were sons of the principal wife and four were sons of the concubine (Genesis Rabbah 57:3).

וַיְהִ֗י אַחֲרֵי֙ הַדְּבָרִ֣ים הָאֵ֔לֶּה וַיֻּגַּ֥ד לְאַבְרָהָ֖ם לֵאמֹ֑ר הִ֠נֵּ֠ה יָלְדָ֨ה מִלְכָּ֥ה גַם־הִ֛וא בָּנִ֖ים לְנָח֥וֹר אָחִֽיךָ׃

And it came to pass after these things, that it was told Avraham, saying, Behold Milka, she also has born children to thy brother Naĥor;