One day an acquaintance met the great scholar and said,
"Do you know what I just heard about your friend?
Scholar : Hold on a minute, before telling me anything I'd like you to pass a little test. It's called the Triple Filter Test.
Is what you want to tell me about my friend going to be useful to me?
يَا أَيُّهَا الَّذِينَ آمَنُوا اجْتَنِبُوا كَثِيراً مِّنَ الظَّنِّ إِنَّ بَعْضَ الظَّنِّ إِثْمٌ وَلا تَجَسَّسُوا وَلا يَغْتَب بَّعْضُكُم بَعْضًا أَيُحِبُّ أَحَدُكُمْ أَن يَأْكُلَ لَحْمَ أَخِيهِ مَيْتًا فَكَرِهْتُمُوهُ وَاتَّقُوا اللَّهَ إِنَّ اللَّهَ تَوَّابٌ رَّحِيمٌ
Surah 49 Al-Hujurat Ayah 12
O you who believe! Avoid much suspicions, indeed some suspicions are sins. And spy not, neither backbite one another. Would one of you like to eat the flesh of his dead brother? You would hate it (so hate backbiting) . And fear Allah. Verily, Allah is the One Who accepts repentance, Most Merciful.