Genesis 15:10 ASV

⁸  And he said, O Lord Jehovah, whereby shall I know that I shall inherit it?

⁹  And he said unto him, Take me a heifer three years old, and a she-goat three years old, and a ram three years old, and a turtle-dove, and a young pigeon.

¹⁰  And he took him all these, and divided them in the midst, and laid each half over against the other: but the birds divided he not.

¹¹  And the birds of prey came down upon the carcasses, and Abram drove them away.

¹²  And when the sun was going down, a deep sleep fell upon Abram; and, lo, a horror of great darkness fell upon him.