At Tur, 38 Ayah
52:38
أَمۡ لَهُمۡ سُلَّمٞ يَسۡتَمِعُونَ فِيهِۖ فَلۡيَأۡتِ مُسۡتَمِعُهُم بِسُلۡطَٰنٖ مُّبِينٍ ٣٨
'Am Lahum Sullamun Yastami`ūna Fīhi ۖ Falya'ti Mustami`uhum Bisulţānin Mubīnin
Or have they a stairway [into the heaven] upon which they listen? Then let their listener produce a clear authority.