Genesis 15:8-10

15:8 But Abram said, “O sovereign Lord, by what can I know that I am to possess it?”

15:9 The Lord said to him, “Take for me a heifer, a goat, and a ram, each three years old, along with a dove and a young pigeon.” 15:10 So Abram took all these for him and then cut them in two and placed each half opposite the other, but he did not cut the birds in half.