Genesis 15:8-11

But Abram said, “Lord GOD, how can I be sure that I will own this land?” The LORD said to Abram, “Bring me a three-year-old cow, a three-year-old goat, a three-year-old male sheep, a dove, and a young pigeon.” Abram brought them all to God. Then Abram killed the animals and cut each of them into two pieces, laying each half opposite the other half. But he did not cut the birds in half. Later, large birds flew down to eat the animals, but Abram chased them away.