Gen 17:22

“AND G-D WENT UP FROM ABRAHAM. This is an expression of respect towards G-d, was standing beside Abraham, why then is it written, And He went up, suggesting that G-d had been above him? It is out of respect to G-d that this is so written. (Gur Aryeh.) and we learn from it that the righteous are the Chariot of the Holy One, blessed be He. Thus the language of Rashi. But the saying of the Sages in the Bereshith Rabbah is: “It is the patriarchs that constitute the Chariot.” This is an allusion to that which is written: Thou wilt give truth to Jacob, kindness to Abraham; And the Fear of Isaac had been on my side. The student learned [in the mysteries of the Torah] will understand.”

“And he left off talking; with him,.... After he had finished all he had to say to him at this time. It was great condescension in the divine Being to talk with a creature; it was wonderful grace and kindness to make such promises to him, as he did, and indulge him with answers of prayer and communion with him; but the highest enjoyments of God here are not lasting; uninterrupted communion with him is reserved for another world: and God went up from Abraham; from the earth, where he had been with Abraham, and ascended above him up to heaven, in a visible, and very likely in an human form, in which he descended: the Targums of Onkelos and Jonathan paraphrase it, "the glory of the Lord", the glorious Shechinah, the Lord of life and glory.”

“God went up from Abraham - Ascended evidently before him, so that he had the fullest proof that it was no human being, no earthly angel or messenger, that talked with him; and the promise of a son in the course of a single year, at this set time in the next year, Gen 17:21, which had every human probability against it, was to be the sure token of the truth of all that had hitherto taken place, and the proof that all that was farther promised should be fulfilled in its due time. Was it not in nearly the same way in which the Lord went up from Abraham, that Jesus Christ ascended to heaven in the presence of his disciples? Luk 24:51.”

“When God had finished His address and ascended again, Abraham immediately fulfilled the covenant duty enjoined upon him, by circumcision himself on that very day, along with all the male members of his house. Because Ishmael was 13 years old when he was circumcised, the Arabs even now defer circumcision to a much later period than the Jews, generally till between the ages of 5 and 13, and frequently even till the 13th year.”