Genesis 15:10-12

Young's Literal Translation

¹⁰ and he taketh to him all these, and separateth them in the midst, and putteth each piece over against its fellow, but the bird he hath not divided;

¹¹ and the ravenous birds come down upon the carcases, and Abram causeth them to turn back.

¹² And the sun is about to go in, and deep sleep hath fallen upon Abram, and lo, a terror of great darkness is falling upon him;