From Beau Ballentine on the official God is Open Facebook group:

Revelation 13:8

All who dwell on the earth will worship him, whose names have not been written in the Book of Life of the Lamb slain from the foundation of the world.

If Christ had been slain previously, before the foundation of the world, then there would have been no need for the righteous dead to wait in Abraham’s Bosom “until the death of the one who is high priest in those days.”