Genesis 15:10

7 He said to him, "I am Yahweh who brought you out of Ur of the Chaldees, to give you this land to inherit it."

8 He said, "Lord Yahweh, whereby will I know that I will inherit it?"

9 He said to him, "Take me a heifer three years old, a female goat three years old, a ram three years old, a turtle-dove, and a young pigeon."

10 He took him all these, and divided them in the midst, and laid each half opposite the other; but he didn`t divide the birds.

11 The birds of prey came down on the carcasses, and Abram drove them away.

12 When the sun was going down, a deep sleep fell on Abram. Now terror and great darkness fell on him.

13 He said to Abram, "Know for sure that your seed will be sojourners in a land that is not theirs, and will serve them. They will afflict them four hundred years.