Adam Clarke, on Gen 17:22

“And when he had left off speaking with him, God went up from Abraham.”

“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.”

Imported from an open dataset — not yet checked against the printed edition.