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.