John Gills Exposition of the Bible Commentary - Genesis 15:13
And he said unto Abram ,.... While he was in a deep sleep; this he said to him in a vision of prophecy: know of a surety , or "in knowing thou shall or mayest know" F14 ידע תדע "cognoscendo cognosces", Pagninus, Montanus; so Schmidt. ; and be assured of it, being now told it by the Lord himself, who foreknows all things that ever come to pass; many of which he acquaints his people with beforehand, nor would he hide from Abram his friend what should befall his posterity, as... read more
Matthew Henry's Complete Commentary - Genesis 15:12-16
We have here a full and particular discovery made to Abram of God's purposes concerning his seed. Observe, I. The time when God came to him with this discovery: When the sun was going down, or declining, about the time of the evening oblation, 1 Kgs. 18:36; Dan. 9:21. Early in the morning, before day, while the stars were yet to be seen, God had given him orders concerning the sacrifices (Gen. 15:5), and we may suppose it was, at least, his morning's work to prepare them and set them in order;... read more