﴿ وَإِذَا قِيلَ لَهُمُ ٱسْجُدُوا۟ لِلرَّحْمَٰنِ قَالُوا۟ وَمَا ٱلرَّحْمَٰنُ أَنَسْجُدُ لِمَا تَأْمُرُنَا وَزَادَهُمْ نُفُورًۭا ۩ ﴾

“Yet when they [who are bent on denying the truth! are told, “Prostrate yourselves before the Most Gracious.” they are wont to ask, “And [who and] what is the Most Gracious? Are we to prostrate ourselves before whatever thou biddest us [to worship]?” - and so [thy call] but increases their aversion,”

قَالُوا وَمَا الرَّ‌حْمَـٰنُ (60) The word رَّ‌حْمَـٰنُ (Rahman, translated as All-Merciful) is an Arabic word and all Arabs knew its meaning, but they did not use it for Allah Ta’ ala. Hence they enquired who and what is Rahman (رَّ‌حْمَـٰنُ ).