At-Toor - 38

﴿أَمْ لَهُمْ سُلَّمٌ يَسْتَمِعُونَ فِيهِ ۖ فَلْيَأْتِ مُسْتَمِعُهُمْ بِسُلْطَانٍ مُبِينٍ﴾

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