Genesis 15:7-10

7Then He said to him, “I am the Lord, who brought you out of Ur of the Chaldeans, to give you this land to inherit it.”

8And he said, “Lord God, how shall I know that I will inherit it?”

9So He said to him, “Bring Me a three-year-old heifer, a three-year-old female goat, a three-year-old ram, a turtledove, and a young pigeon.”

10Then he brought all these to Him and cut them in two, down the middle, and placed each piece opposite the other; but he did not cut the birds in two.