At the very moment the covenant is sealed, immediately following grand promises of eternal land and offspring, the atmosphere abruptly shifts. Light gives way to darkness, and tranquility is replaced by a profound anxiety. This sharp transition prepares Abraham for the complex reality of Jewish history, where divine promises will be intertwined with periods of suffering and subjugation. The setting of the sun marks this shift. Because Abraham had just been taken outside to count the stars, this entire experience is understood not as a physical sequence of events, but as a continuous prophetic vision occurring at a single point in time [אבן עזרא, רד״ק, יהל אור]. Alternatively, noting the exact time of day emphasizes that it was still light out, making it an unnatural time for sleep [חזקוני]. On a symbolic level, the sunset represents the concealment of manifest divine providence, signaling the fading of peaceful light as the darkness of exile approaches [רד״ק, העמק דבר, מלבי״ם].
A deep sleep then falls upon Abraham. This is not ordinary fatigue, but rather a paralysis of the senses, an inability to remain awake, and a total disconnection from his physical surroundings—a profound state of consciousness characteristic of prophetic revelation [רד״ק, ביאור יש״ר, שטיינזלץ, אם למקרא, פירושן של נשים]. This trance is brought on either by the overwhelming awe of the Divine Presence [בכור שור] or by the heavy emotional burden of the difficult news God is about to deliver [רד״ק, שד״ל, קרני אור]. Within this deep sleep, Abraham is gripped by a great, dark dread. The intense darkness serves to describe the sheer magnitude of his terror, painting a picture of deep, gloomy anxiety [מלבי״ם, הכתב והקבלה, ביאור יש״ר, שטיינזלץ]. Darkness itself acts as a synonym for fear, as a person surrounded by pitch blackness is naturally filled with dread [שד״ל].
This formless terror serves as a clear indication of future national struggles [רש״י, רמב״ן, רבנו בחיי]. Most commentators agree that the specific terms used to describe this dark dread allude to the four future empires that will subjugate the Israelites: Babylon, Media, Greece, and Edom [רמב״ן, רבנו בחיי, דעת זקנים, חומת אנך]. God establishes a covenant to give the land to Abraham, but it comes with a condition: if his descendants sin, they will face subjugation by the nations of the world. The setting sun specifically points to the first of these periods of exile in Egypt, which had already been decreed [רמב״ן, רד״ק, הטור הארוך].
This raises a profound question: why would God reveal the horrors of exile at the exact moment of forging a covenant of eternal love? The primary approach among commentators is that exile does not represent divine distance or rejection. Instead, it is a necessary process of purification intended to subdue materialism, refine the nation, and prepare them for their ultimate redemption [מלבי״ם, חומש קה״ת]. During this vision, God presented Abraham with a difficult choice regarding his descendants' fate should they sin: they could face either the spiritual punishment of Hell or the earthly subjugation of exile. Abraham was terrified, fearing that the crushing burden and suffering of exile would cause his children to assimilate among the nations and lose their way entirely. However, God advised him to choose the purifying path of exile, promising that the merit of their forefathers would protect them, ensuring they would survive the darkness and eventually emerge stronger than before [פענח רזא, דעת זקנים, פרדס יוסף, קונטרס חיבה יתירה].