Abraham offered the sacrifice of the doves, ram and heifer as the conditional objects to restore the foundation of faith (Gen. 15:9). According to Gen. 15:10-13, Abraham cut the offerings in two and laid each half over against the other, but he did not cut the doves in two. Birds of prey, symbolizing Satan came down upon the carcasses and Abraham drove them away. Then God appeared to Abraham and said to him: "Know of a surety that your descendants will be sojourners in the land that is not theirs, and will be slaves there, and they will be oppressed for 400 years…" (Gen. 15:13). Thus, because Abraham did not cut the doves in two, the Israelites had to suffer 400 years of slavery in Egypt