The Holy Quran 24:15 — Surah An-Nur

Arabic text

إِذْ تَلَقَّوْنَهُۥ بِأَلْسِنَتِكُمْ وَتَقُولُونَ بِأَفْوَاهِكُم مَّا لَيْسَ لَكُم بِهِۦ عِلْمٌ وَتَحْسَبُونَهُۥ هَيِّنًا وَهُوَ عِندَ ٱللَّهِ عَظِيمٌ

Translation

...When you gossiped about the matter with your tongues and said such things with your mouths that you had no knowledge of. You thought that the matter was trivial, whereas it was grave (a grave sin) in Allaah's sight. (Although slandering any person is a major sin, the sin is especially worse when the accused is a chaste wife of Rasulullaah ﷺ)

Tafsir (excerpt) — Tafsir Usmani

Spreading a slander without investigation is a great crime: that is, why would you not have deserved a great punishment when you were passing on to one another such an uninvestigated and manifestly false thing, and uttering with your tongues random guesses of whose reality you had no knowledge at all?

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