Genesis 15:4 And, behold, the word of the Lord came unto him, saying, This shall not be thine heir; but he that shall come forth out of thine own bowels shall be thine heir. 5 And he brought him forth abroad, and said, Look now toward heaven, and tell the stars, if thou be able to number them: and he said unto him, So shall thy seed be.
[Patriarchs & Prophets pp 137] Still the patriarch begged for some visible token as a confirmation of his faith and as an evidence to after-generations that God's gracious purposes toward them would be accomplished. The Lord condescended to enter into a covenant with His servant, employing such forms as were customary among men for the ratification of a solemn engagement. By divine direction, Abraham sacrificed a heifer, a she-goat, and a ram, each three years old, dividing the bodies and laying the pieces a little distance apart. To these he added a turtledove and a young pigeon, which, however, were not divided.
This being done, he reverently passed between the parts of the sacrifice, making a solemn vow to God of perpetual obedience. Watchful and steadfast, he remained beside the carcasses till the going down of the sun, to guard them from being defiled or devoured by birds of prey. About sunset he sank into a deep sleep; and, “lo, a horror of great darkness fell upon him.” And the voice of God was heard, bidding him not to expect immediate possession of the Promised Land, and pointing forward to the sufferings of his posterity before their establishment in Canaan. The plan of redemption was here opened to him, in the death of Christ, the great sacrifice, and His coming in glory.
Abraham saw also the earth restored to its Eden beauty, to be given him for an everlasting possession, as the final and complete fulfillment of the promise. As a pledge of this covenant of God with men, a smoking furnace and a burning lamp, symbols of the divine presence, passed between the severed victims, totally consuming them. And again a voice was heard by Abraham, confirming the gift of the land of Canaan to his descendants, “from the river of Egypt unto the great river, the river Euphrates.”
Hebrews 11:9 By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise: 10 For he looked for a city which hath foundations, whose builder and maker is God.
May God add His blessing to the study of His word. "Good night" and God bless!