Genesis 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.

The sun going down denotes the season of sacrifice, Daniel 9:21.Concerning the sleep, see Genesis 2:21. Solomon's Song Song of Solomon 5:1; Matthew 25:5. Concerning the horror-(perhaps a cry in the soul, like that at midnight, Matthew 25:6) See Psalms 55:5; Acts 16:29; Acts 16:29. Or may we not in both observe an emblem of the different tendencies in the law and the gospel? 2 Corinthians 3:13; Hebrews 12:22; Hebrews 12:22. As it was said of the Lord Jesus, that Christ ought first to suffer, and then enter into his glory; so his people. Luke 24:26.