Qur'an 52:38 · At-Tur

أَمْ لَهُمْ سُلَّمٌۭ يَسْتَمِعُونَ فِيهِ ۖ فَلْيَأْتِ مُسْتَمِعُهُم بِسُلْطَٰنٍۢ مُّبِينٍ

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