Gen 15:1
After these things the word of the LORD came unto Abram
in a vision, saying, Fear not, Abram: I
am thy shield,
and thy exceeding great reward.
Gen 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.
A vision of the lake of fire prepared for lost souls of men perhaps? The bookend to the resurrection to life that Abraham witnessed?