Az-Zukhruf 43:21 ام اتيناهم كتابا من قبله فهم به مستمسكون ٢١
أَمۡ
ءَاتَيۡنَٰهُمۡ
كِتَٰبٗا
مِّن
قَبۡلِهِۦ
فَهُم
بِهِۦ
مُسۡتَمۡسِكُونَ
٢١
いや、一体われらが彼らに、それ（クルアーン*）以前に啓典を授けたのであり、彼らがそれを厳守し（、使徒*に対する自分たちの主張の根拠とし）ているとでも？
Read Tafsir
Ibn Kathir (Abridged)
The Idolators have no Proof
Allah condemns the idolators for worshipping others instead of Allah with no evidence or proof for doing so.
أَمْ ءَاتَيْنَـهُمْ كِتَـباً مِّن قَبْلِهِ
(Or have We given them any Book before this) means, before their idolatry.
فَهُم بِهِ مُسْتَمْسِكُونَ
(to which they are hold
…The Idolators have no Proof
Allah condemns the idolators for worshipping others instead of Allah with no evidence or proof for doing so.
أَمْ ءَاتَيْنَـ
…