وَلَقَدْ أَرْسَلْنَا مُوسَىٰ بِـَٔايَـٰتِنَا وَسُلْطَـٰنٍ مُّبِينٍ

And We did certainly send Moses with Our signs and a clear authority1

هود 96

أَمْ لَهُمْ سُلَّمٌ يَسْتَمِعُونَ فِيهِ ۖ فَلْيَأْتِ مُسْتَمِعُهُم بِسُلْطَـٰنٍ مُّبِينٍ

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

الطور 38