Genesis 15:9-12
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
He brought him all of these, and divided them in the middle, 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.