Genesis 15:10

7 And he said to him, I am the Lord, who took you from Ur of the Chaldees, to give you this land for your heritage.

8 And he said, O Lord God, how may I be certain that it will be mine?

9 And he said, Take a young cow of three years old, and a she-goat of three years old, and a sheep of three years old, and a dove and a young pigeon.

10 All these he took, cutting them in two and putting one half opposite the other, but not cutting the birds in two.

11 And evil birds came down on the bodies, but Abram sent them away.

12 Now when the sun was going down, a deep sleep came on Abram, and a dark cloud of fear.

13 And he said to Abram, Truly, your seed will be living in a land which is not theirs, as servants to a people who will be cruel to them for four hundred years;