أَم لَهُم سُلَّمٌ يَستَمِعونَ فيهِ ۖ فَليَأتِ مُستَمِعُهُم بِسُلطانٍ مُبينٍ

Or have they a stairway [into the heaven] upon which they listen? Then let their listener produce a clear authority.