أَمْ لَهُمْ سُلَّمٌ يَسْتَمِعُونَ فِيهِ ۖ فَلْيَأْتِ مُسْتَمِعُهُم بِسُلْطَٰنٍ مُّبِينٍ

Or have they the means by which they listen? Then let their listener bring a clear authority.