Surah Al-Hujurat (The Private Quarters), Verse 12

یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوا اجْتَنِبُوْا كَثِیْرًا مِّنَ الظَّنِّ اِنَّ بَعْضَ الظَّنِّ اِثْمٌ وَّلَا تَجَسَّسُوْا وَلَا یَغْتَبْ بَّعْضُكُمْ بَعْضًا اَیُحِبُّ اَحَدُكُمْ اَنْ یَّاْكُلَ لَحْمَ اَخِیْهِ مَیْتًا فَكَرِهْتُمُوْهُ وَاتَّقُوا اللّٰهَ اِنَّ اللّٰهَ تَوَّابٌ رَّحِیْمٌ ۟

Yaaa ayyuhal lazeena aamanuj taniboo kaseeram minaz zanni inna ba'daz zanniismunw wa laa tajassasoo wa la yaghtab ba'dukum ba'daa; a yuhibbu ahadukum any yaakula lahma akheehi maitan fakarih tumooh; wattaqul laa; innal laaha tawwaabur Raheem

“O ye who believe! Avoid suspicion as much (as possible): for suspicion in some cases is a sin: And spy not on each other nor speak ill of each other behind their backs. Would any of you like to eat the flesh of his dead brother? Nay, ye would abhor it... But fear Allah: For Allah is Oft- Returning, Most Merciful.”

Quran 49:12 (Yusuf Ali Translation)