Genesis 1:7

⁷ And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.

David and Israel

In Jeremiah 33:26, this signifies people who are in spiritual divine truth, and people who are in natural-spiritual divine truth. (Apocalypse Explained 768[17], Divine Love and Wisdom 43, 44)