Abram's sign of the covenant
Ge 15:9 And he said unto him, Take me an heifer of three years old, and a she goat of three years old, and a ram of three years old, and a turtledove, and a young pigeon.
Ge 15:10 And he took unto him all these, and divided them in the midst, and laid each piece one against another: but the birds divided he not.
Ge 15:11 And when the fowls came down upon the carcases, Abram drove them away.
Ge 15:12 ¶ And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.
Ge 15:13 And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land [that is] not theirs, and shall serve them; and they shall afflict them four hundred years;