"So I swear by the retreating stars.."

So I swear by the retreating stars –Those that run [their courses] and disappear [i.e., set] And by the night as it closes in And by the dawn when it breathes [i.e., stirs] [That] indeed, it [i.e., the QurÕan] is a word [conveyed by] a noble messenger [i.e., Gabriel]