And he said unto him, I am the LORD that brought thee out of Ur of the Chaldees, to give thee this land to inherit it.

Wesley's Notes

15:7 I am the lord that brought thee out of Ur of the Chaldees - Out of the fire of the Chaldees, so some: that is, from their idolatries; for the Chaldeans worshipped the fire. Or, from their persecutions. The Jewish writers have a tradition, that Abram was cast into a fiery furnace for refusing to worship idols, and was miraculously delivered. It is rather a place of that name. Thence God brought him by an effectual call, brought him by a gracious violence; snatched him as a brand out of the burning. Observe how God speaks of it as that which he gloried in. I am the Lord that brought thee out - He glories in it as an act both of power and grace. To give thee this land to inherit it - Not only to possess it, but to possess it as an inheritance, which is the surest title. The providence of God hath secret, but gracious designs in all its various dispensations: we cannot conceive the projects of providence, 'till the event shews what it was driving at.

Matthew Henry's Concise Commentary

15:7-11 Assurance was given to Abram of the land of Canaan for an inheritance. God never promises more than he is able to perform, as men often do. Abram did as God commanded him. He divided the beasts in the midst, according to the ceremony used in confirming covenants, Jer 34:18,19. Having prepared according to God's appointment, he set himself to wait for the sign God might give him. A watch must be kept upon our spiritual sacrifices. When vain thoughts, like these fowls, come down upon our sacrifices, we must drive them away, and seek to attend on God without distraction.