Genesis 15:9-11

Young's Literal Translation

⁹ And He saith unto him, `Take for Me a heifer of three years, and a she-goat of three years, and a ram of three years, and a turtle-dove, and a young bird;'

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.