The Holy Quran 52:38 — Surah At-Tur
Arabic text
أَمْ لَهُمْ سُلَّمٌ يَسْتَمِعُونَ فِيهِ ۖ فَلْيَأْتِ مُسْتَمِعُهُم بِسُلْطَـٰنٍ مُّبِينٍ
Translation
Or do they (the Kuffaar) have a ladder (into the heavens) by which they are able to eavesdrop (and hear divine revelation that permits them to commit kufr)? So (if they have heard some revelation to substantiate their standpoint,) let their eavesdropper produce a clear proof (from this revelation to prove the legitimacy of their acts of kufr).
Tafsir (excerpt) — Tafsir Usmani
that is, do they claim that they set up a ladder, climb up to the heaven and come back having heard there the talk of the Exalted Assembly [of angels]? Then, when they have direct access to that court, what need remains for them to follow any human being? Whoever makes such a claim, let him by all means present his authority and proof.
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