Genesis 15:17

Smoking furnace and a burning lamp - Probably the smoking furnace might be designed as an emblem of the sore afflictions of the Israelites in Egypt; but the burning lamp was certainly the symbol of the Divine presence, which, passing between the pieces, ratified the covenant with Abram, as the following verse immediately states.

And the sun went down. - The light of day is gone. The covenant is now formally concluded. Abram had risen to the height of faith in the God of promise. He is come into the position of the father of the faithful. He is therefore qualified for entering into this solemn compact. This covenant has a uniqueness which distinguishes it from that with Noah. It refers to a patriarch and his seed chosen out of a coexisting race. It is not, however, subversive of the ancient and general covenant, but only a special measure for overcoming the legal and moral difficulties in the way, and ultimately bringing its comprehensive provisions into effect. It refers to the land of promise, which is not only a reality, but a type and an earnest of all analogous blessings.

The oven of smoke and lamp of flame symbolize the smoke of destruction and the light of salvation. Their passing through the pieces of the victims and probably consuming them as an accepted sacrifice are the ratification of the covenant on the part of God, as the dividing and presenting of them were on the part of Abram. The propitiatory foundation of the covenant here comes into view, and connects Abram with Habel and Noah, the primeval confessors of the necessity of an atonement.

15:17 When the sun was gone down the sign was given — The smoaking furnace signified the affliction of his seed in Egypt: they were there in the furnace of affliction, and labouring in the very fire. They were there in the smoke, their eyes darkened that they could not see to the end of their troubles. 2. The burning lamp speaks comfort in this affliction; and this God shewed Abram at the same time with the smoaking furnace. The lamp notes direction in the smoke; God's word was their lamp, a light shining in a dark place. Perhaps too this burning lamp prefigured the pillar of a cloud and fire which led them out of Egypt. 3. The passing of these between the pieces was the confirming of the covenant God now made with him. It is probable this furnace and lamp, which passed between the pieces, burned and consumed them, and so compleated the sacrifice, and testified God's acceptance of it, as of Gideon's, Judges 6:21, Manoah's, Judges 13:19,20, and Solomon's, 2 Chronicles 7:1. So it intimates, 1. That God's covenants with man are made by sacrifice, Psalms 50:5, by Christ, the great sacrifice. 2. God's acceptance of our spiritual sacrifices is a token for good, and an earnest of farther favours.