﴿ أَمْ ءَاتَيْنَٰهُمْ كِتَٰبًۭا مِّن قَبْلِهِۦ فَهُم بِهِۦ مُسْتَمْسِكُونَ ﴾

“Or have We, perchance, vouchsafed them, before this one, a revelation [to the contrary,] to which they are still holding fast?”

Or have We brought them a scripture before that is before the Qur’ān that they should worship other than God so that they are holding fast to it? In other words this never happened.