Likutei Halakhot, Orach Chaim, Laws of Morning Hand Washing 2:5/ליקוטי הלכות·אורח חיים·הלכות נטילת ידים שחרית ב׳:ה׳

1This is the aspect of "And he divided himself against them" (Genesis 14:15) which is said about Abraham at the time he chased after the kings. For Abraham revealed G-d's blessed providence in the world. Therefore, the essence of the fulfillment of the generations of the heavens and earth is through Abraham, as it is written (Genesis 2:4) "These are the generations of the heavens and the earth when they were created, בְּהִבָּרְאָם - meaning, through Abraham בְּאַבְרָהָם (Genesis Rabbah 2:4). Abraham revealed His blessed providence to the world; for the essence of the existence of the world is through this. Therefore, Abraham had the power to divide the night, in other words to break the night, which is the aspect of nullification of nature, the aspect of rising at midnight, as explained above. Then {Abraham} overpowered the four kings, which are the aspect of the four Malchuyot, as brought. The essence of their subjugation is through the nullification of nature, as explained above. Therefore, because he erred {by saying} what was written there (Genesis 15:8) "how will I know that I will inherit it?", the exile was decreed because of this, for it was a blemish in knowledge, which is the aspect of divine providence. The essence of knowledge is the aspect of divine providence. And divine providence, this is the aspect of the Land of Israel, the aspect of (Deuteronomy 11:12) "the eyes of Lord your God are always upon it", as Rebbe Nachman wrote in another place. Therefore, because he blemished the da'at/knowledge and blemished the Land of Israel, which is the aspect of divine providence, (Genesis 15:12) "a deep sleep fell upon Abram, and behold, a fright, a great darkness was falling upon him". Because he saw the strength of the exile, which is the aspect of 'a deep sleep', the aspect of darkness, the essence of their subjugation through the natural sciences, through the blemishing of divine providence, as explained above.