Sūrat al-Raḥmān is a prominent example of Qur’anic rhetorical distinctiveness. Divine benefactions, the address to humanity and jinn, and a recurring question create an integrated form of speech. Repetition does not merely increase the number of words; it renews recognition of the gifts under discussion.
فَبِأَيِّ آلَاءِ رَبِّكُمَا تُكَذِّبَانِ
Which of your Lord’s favors will you two deny?
Each occurrence is linked with its immediate surrounding subject. Repetition can therefore intensify, rather than weaken, an educational and spiritual message.