أَمْ ءَاتَيْنَـٰهُمْ كِتَـٰبًا مِّن قَبْلِهِۦ فَهُم بِهِۦ مُسْتَمْسِكُونَ ٢١
Or have We given them a book before it [i.e., the Qur’ān] to which they are adhering?