What does Genesis 15:12 mean?
Abram, the man who will soon be renamed Abraham, is in the midst of a covenant ritual between himself and the Lord. In the previous verses, the Lord instructed Abram to bring to him five animals. Abram cut a heifer, goat, and ram in half, arranging the halves opposite of each other and chasing birds of prey away from them. This attack on the covenant promise is symbolic of Israel's future captivity under Egypt.At this point in the story, the sun is going down. Previously, God had instructed Abram to look at the stars (Genesis 15:5). That moment either took place within Abram's vision or on the previous night. On this night, at dusk, Abram seems supernaturally overpowered by a deep sleep and a great and dreadful darkness.
In the following verses, the Lord will speak to Abram in a dream or vision as he sleeps or after Abram is awakened. The upcoming words will prophesy the slavery of Abram's descendants in Egypt, their eventual exodus, and their conquest of the sinful nations of Canaan.