And the sun was about to set. - This visit of the Lord to Abram continues for two nights, with the intervening day. In the former night he led him forth to view the stars Genesis 15:5. The second night sets in with the consummation of the covenant Genesis 15:17. The revelation comes to Abram in a trance of deep sleep. The Lord releases the mind from attention to the communications of sense in order to engage it with higher things. And he who makes the loftier revelation can enable the recipient to distinguish the voice of heaven from the play of fancy.

A deep sleep - תרדמה tardemah, the same word which is used to express the sleep into which Adam was cast, previous to the formation of Eve; Genesis 2:21.

A horror of great darkness - Which God designed to be expressive of the affliction and misery into which his posterity should be brought during the four hundred years of their bondage in Egypt; as the next verse particularly states.

And when the sun was going down,.... Just setting, descending below the hemisphere; or "about to enter" (m) into his chamber, as Piscator observes, from whence he went forth in the morning, as a strong man to run his race; which at sunset is finished according to human appearance, and the common apprehensions of men, who have thought it goes under the earth, or drops into the ocean, see Psalm 19:5,

a deep sleep fell upon Abram: through the great fatigue he had had the preceding day, in doing what is before related; or rather through a more than ordinary influence of God upon him, which bound up his senses, and cast him into an ecstasy or trance, when he had the following prophecy and vision, which more fully explained to him the emblem he had been conversant with; this was such a sleep as fell on Adam, Genesis 2:21,

and, lo, an horror of great darkness fell upon him; or such darkness as was horrible and terrible, so it was represented to his mind in vision; which signified the great afflictions after expressed by darkness, that should come upon his children in Egypt and elsewhere: and so Jarchi says it refers to the distresses and darkness of their captivities in Egypt, and in other places. The Targumists observe, that Abram in this vision saw the four monarchies that should bring his children into bondage.

(m) "et fuit sol ad intrandum", Montanus, Piscator.

"And when the sun was just about to go down (on the construction, see Ges. 132), and deep sleep (תּרדּמה, as in Genesis 2:21, a deep sleep produced by God) had fallen upon Abram, behold there fell upon him terror, great darkness." The vision here passes into a prophetic sleep produced by God. In this sleep there fell upon Abram dread and darkness; this is shown by the interchange of the perfect נפלה and the participle נפלת. The reference to the time is intended to show "the supernatural character of the darkness and sleep, and the distinction between the vision and a dream" (O. v. Gerlach). It also possesses a symbolical meaning. The setting of the sun prefigured to Abram the departure of the sun of grace, which shone upon Israel, and the commencement of a dark and dreadful period of suffering for his posterity, the very anticipation of which involved Abram in darkness. For the words which he heard in the darkness were these (Genesis 15:13.): "Know of a surety, that thy seed shall be a stranger in a land that is not theirs, and shall serve them (the lords of the strange land), and they (the foreigners) shall oppress them 400 years." That these words had reference to the sojourn of the children of Israel in Egypt, is placed beyond all doubt by the fulfilment. The 400 years were, according to prophetic language, a round number for the 430 years that Israel spent in Egypt (Exodus 12:40). "Also that nation whom they shall serve will I judge (see the fulfilment, Exodus 6:11); and afterward shall they come out with great substance (the actual fact according to Exodus 12:31-36). And thou shalt go to thy fathers in peace, and be buried in a good old age (cf. Genesis 25:7-8); and in the fourth generation they shall come hither again." The calculations are made here on the basis of a hundred years to a generation: not too much for those times, when the average duration of life was above 150 years, and Isaac was born in the hundredth year of Abraham's life. "For the iniquity of the Amorites is not yet full." Amorite, the name of the most powerful tribe of the Canaanites, is used here as the common name of all the inhabitants of Canaan, just as in Joshua 24:15 (cf. Genesis 10:5), Judges 6:10, etc.).

By this revelation Abram had the future history of his seed pointed out to him in general outlines, and was informed at the same time why neither he nor his descendants could obtain immediate possession of the promised land, viz., because the Canaanites were not yet ripe for the sentence of extermination.

And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.

15:12 And when the sun was going down - About the time of the evening oblation. Early in the morning, while the stars were yet to be seen, God had given him orders concerning the sacrifices, Ge 15:5, and we may suppose it was at least his morning's work to prepare them, and set them in order; which when he had done, he abode by them praying and waiting 'till towards evening. A deep sleep fell upon Abram - Not a common sleep through weariness or carelessness, but a divine extasy, that being wholly taken off from things sensible, he might be wholly taken up with the contemplation of things spiritual. The doors of the body were locked up, that the soul might be private and retired, and might act the more freely. And lo, a horror of great darkness fell upon him - This was designed to strike an awe upon the spirit of Abram, and to possess him with a holy reverence. Holy fear prepares the soul for holy joy; God humbles first, and then lifts up.

15:12-16 A deep sleep fell upon Abram; with this sleep a horror of great darkness fell upon him: a sudden change. The children of light do not always walk in the light. Several things were then foretold. 1. The suffering state of Abram's seed for a long time. They shall be strangers. The heirs of heaven are strangers on earth. They shall be servants; but Canaanites serve under a curse, the Hebrews under a blessing. They shall be suffers. Those that are blessed and beloved of God, are often sorely afflicted by wicked men. 2. The judgment of the enemies of Abram's seed. Though God may allow persecutors and oppressors to trample upon his people a great while, he will certainly reckon with them at last. 3. That great event, the deliverance of Abram's seed out of Egypt, is here foretold. 4. Their happy settlement in Canaan. They shall come hither again. The measure of sin fills gradually. Some people's measure of sin fills slowly. The knowledge of future events would seldom add to our comfort. In the most favoured families, and most happy lives, there are so many afflictions, that it is merciful in God to conceal what will befall us and ours.