Genesis 15:7-11

7And he said to him, I am the LORD that brought thee out of Ur of the Chaldees, to give thee this land to inherit it. 8And he said, Lord GOD, by what shall I know that I shall inherit it? 9And he said to him, Take me an heifer of three years old, and a female goat of three years old, and a ram of three years old, and a turtledove, and a young pigeon. 10And he took to him all these, and divided them in the midst, and laid each piece one against another: but the birds he did not divide. 11And when the fowls came down upon the carcases, Abram drove them away.