Genesis 15:10-12

American Standard Version

¹⁰ And he took him all these, and divided them in the midst, and laid each half over against the other: but the birds divided he not. ¹¹ And the birds of prey came down upon the carcasses, and Abram drove them away.

¹² And when the sun was going down, a deep sleep fell upon Abram; and, lo, a horror of great darkness fell upon him.