Genesis 15:7-10

7Then the Lord told him, “I am the Lord who brought you out of Ur of the Chaldeans to give you this land as your possession.”

8But Abram replied, “O Sovereign Lord, how can I be sure that I will actually possess it?”

9The Lord told 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.”

10So Abram presented all these to him and killed them. Then he cut each animal down the middle and laid the halves side by side; he did not, however, cut the birds in half.