15:17-21 The smoking furnace and the burning lamp, probably represented the Israelites' severe trials and joyful deliverance, with their gracious supports in the mean time. It is probable that this furnace and lamp, which passed between the pieces, burned and consumed them, and so completed the sacrifice, and testified God's acceptance of it. So it intimates that God's covenants with man are made by sacrifice, Ps 50:5. And we may know that he accepts our sacrifices, if he kindles in our souls pious and devout affections. The bounds of the land granted are stated. Several nations, or tribes, are spoken of, that must be cast out to make room for the seed of Abram. In this chapter we perceive in Abram faith struggling against, and triumphing over, unbelief. Wonder not, believers, if you meet with seasons of darkness and distress. But it is not the will of God that you should be cast down: fear not; for all that he was to Abram he will be to you.And the Hittites,.... Who had their name from Heth, a son of Canaan, see Genesis 10:15; they dwelt about Hebron, in the south of the land of Canaan:

and the Perizzites; these dwelt in the wood country of the land, Joshua 17:15; and seem to have their name from dwelling in villages, and at a distance from towns and cities, and were a boorish and uncivilized people, see Genesis 13:7,

and the Rephaims; or "giants", as the Targums of Onkelos, and Jonathan; they dwelt near the Perizzites, Joshua 17:15; of these see Genesis 14:5.