الآية رقم (15) - فَلَا أُقْسِمُ بِالْخُنَّسِ

(15) - (So I do not swear by the retreating stars - (15))

The scholars said that (I do not swear) means (I swear). The proof of this is the answer that will come later: ([That] indeed, the Qur’an is a word [conveyed by] a noble messenger)

Hence, the meaning is: I do not need to swear and if I were to swear I would swear by the retreating running stars that travel in the sky, which sometimes run and sometimes disappear.