وَالشَّمْسِ وَضُحَاهَا وَالْقَمَرِ إِذَا تَلَاهَا وَالنَّهَارِ إِذَا جَلَّاهَا وَاللَّيْلِ إِذَا يَغْشَاهَا
By the sun and its brilliance; the moon as it follows it; the day as it reveals it; and the night as it covers it. (91:1–4)
The first wāw is an oath particle; subsequent coordinated expressions continue that oath sequence. Treating every wāw as if it introduced an unrelated assertion would obscure the structure.
Day and night form a contrast; sun and moon have a close association. These links unite the oath objects. Coordination of nouns and phrases must be distinguished from the separate rhetorical question of connecting two independent clauses.