God made unilateral covenant with Abram

Genesis 15:9-21 (ESV)

^9  He said to him, “Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon.”

^10  And he brought him all these, cut them in half, and laid each half over against the other. But he did not cut the birds in half.

^11  And when birds of prey came down on the carcasses, Abram drove them away. 

^12  As the sun was going down, a deep sleep fell on Abram. And behold, dreadful and great darkness fell upon him.

^13  Then the LORD said to Abram, “Know for certain that your offspring will be sojourners in a land that is not theirs and will be servants there, and they will be afflicted for four hundred years.

^14  But I will bring judgment on the nation that they serve, and afterward they shall come out with great possessions.

^15  As for you, you shall go to your fathers in peace; you shall be buried in a good old age.

^16  And they shall come back here in the fourth generation, for the iniquity of the Amorites is not yet complete.” 

^17  When the sun had gone down and it was dark, behold, a smoking fire pot and a flaming torch passed between these pieces.

^18  On that day the LORD made a covenant with Abram, saying, “To your offspring I give this land, from the river of Egypt to the great river, the river Euphrates,

^19  the land of the Kenites, the Kenizzites, the Kadmonites,

^20  the Hittites, the Perizzites, the Rephaim,

^21  the Amorites, the Canaanites, the Girgashites and the Jebusites.”