And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burning lamp that passed between those pieces. 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.
Related Commentaries of Genesis 15:17
Genesis 15:17
17 And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burninga lamp that passed between those pieces.