The Holy Quran 56:79 — Surah Al-Waqi'ah
Arabic text
لَّا يَمَسُّهُۥٓ إِلَّا ٱلْمُطَهَّرُونَ
Translation
Only the pure ones (the angels, who are pure from sin) may touch it (the "Lowhul Mahfoodh"). (The Shayaateen and all evil forces have absolutely no access to it.)
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