Genesis 15:7-11 & 17-18

And he said to him, “I am the Lord who brought you from Ur of the Chalde′ans, to give you this land to possess.” But he said, “O Lord God, how am I to know that I shall possess it?” He said to him, “Bring me a heifer three years old, a she-goat three years old, a ram three years old, a turtledove, and a young pigeon.” And he brought him all these, cut them in two, and laid each half over against the other; but he did not cut the birds in two. And when birds of prey came down upon the carcasses, Abram drove them away.

When the sun had gone down and it was dark, behold, a smoking fire pot and a flaming torch passed between these pieces. On that day the Lord made a covenant with Abram, saying, “To your descendants I give this land, from the river of Egypt to the great river, the river Euphra′tes.