וַיְהִ֤י הַשֶּׁ֙מֶשׁ֙ לָב֔וֹא וְתַרְדֵּמָ֖ה נָפְלָ֣ה עַל־אַבְרָ֑ם וְהִנֵּ֥ה אֵימָ֛ה חֲשֵׁכָ֥ה גְדֹלָ֖ה נֹפֶ֥לֶת עָלָֽיו׃
And it came to pass, that, when the sun was going down, a deep sleep fell upon Abram; and, lo, a dread, even a great darkness, fell upon him.
Find Talmudic references to Genesis 15:12: , passages from the Talmud Bavli and Yerushalmi.