Translation for 43:21

أَمۡ ءَاتَيۡنَٰهُمۡ كِتَٰبٗا مِّن قَبۡلِهِۦ فَهُم بِهِۦ مُسۡتَمۡسِكُونَ ٢١
Or have We given them a Book ˹for proof˺, before this ˹Quran˺, to which they are holding firm?