Surah Az-Zukhruf, Verse 21
أَمْ ءَاتَيْنَٰهُمْ كِتَٰبًۭا مِّن قَبْلِهِۦ فَهُم بِهِۦ مُسْتَمْسِكُونَ
Translation — Sahih International
Or have We given them a book before the Qur'an to which they are adhering?
Source
Kur'an-ı Kerim, Zuhruf Suresi 43:21
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/43-suresi-21-ayet