Matthew Poole and continuators on Genesis 15:11

11 And when the fowls came down upon the carcasses , Abram drove them away .

To devour them: whereby he signifies, either 1. The disturbance and distraction which good men are exposed to in the service of God from evil Spirits and men: or rather 2. The great peril of Abrams posterity, who were not only, torn in pieces, like these sacrifices, but even the remainder of them were likely to be devoured by the Egyptians, whose King is compared to an Eagle, the chief of the Birds of prey, Ezek. 17.

By the blast of his mouth, as the Hebrew word signifies; representing Abrams conquest over all his Enemies by Faith and Prayer, whereby he engaged God to be the preserver and deliverer of his people.