At-Tur · Ayah 38
أَمْ لَهُمْ سُلَّمٌ يَسْتَمِعُونَ فِيهِ فَلْيَأْتِ مُسْتَمِعُهُم بِسُلْطَٰنٍ مُّبِينٍ
Or have they a stairway [into the heaven] upon which they listen? Then let their listener produce a clear authority [i.e., proof].
Quran 52:38 (At-Tur) · Saheeh International, Noor International Center (QuranEnc v1.1.2)