يٰأَيُّهَا ٱلَّذِينَ آمَنُواْ لاَ يَسْخَرْ قَوْمٌ مِّن قَوْمٍ عَسَىٰ أَن يَكُونُواْ خَيْراً مِّنْهُمْ وَلاَ نِسَآءٌ مِّن نِّسَآءٍ عَسَىٰ أَن يَكُنَّ خَيْراً مِّنْهُنَّ وَلاَ تَلْمِزُوۤاْ أَنفُسَكُمْ وَلاَ تَنَابَزُواْ بِٱلأَلْقَابِ بِئْسَ ٱلاسْمُ ٱلْفُسُوقُ بَعْدَ ٱلإَيمَانِ وَمَن لَّمْ يَتُبْ فَأُوْلَـٰئِكَ هُمُ ٱلظَّالِمُونَ

يٰأَيُّهَا ٱلَّذِينَ آمَنُواْ ٱجْتَنِبُواْ كَثِيراً مِّنَ ٱلظَّنِّ إِنَّ بَعْضَ ٱلظَّنِّ إِثْمٌ وَلاَ تَجَسَّسُواْ وَلاَ يَغْتَب بَّعْضُكُم بَعْضاً أَيُحِبُّ أَحَدُكُمْ أَن يَأْكُلَ لَحْمَ أَخِيهِ مَيْتاً فَكَرِهْتُمُوهُ وَٱتَّقُواْ ٱللَّهَ إِنَّ ٱللَّهَ تَوَّابٌ رَّحِيمٌ

Qur’an says

O believers! Let no men laugh at other men who may perhaps be better than themselves; and let no woman laugh at another woman, who may perhaps be better than herself. Do not defame through sarcastic remarks about one another, nor call one another by offensive nicknames. It is an evil thing to be called by a bad name after being a believer, and those who do not repent are the ones who are the wrongdoers. (49:11)

O believers! Avoid immoderate suspicion, for in some cases suspicion is a sin. Do not spy on one another, nor backbite one another (to say something about another behind ones back that if one hears it, dislikes it). Would any of you like to eat the flesh of his dead brother? Surely you would abhor it. Fear Allah; for Allah is the Accepter of repentance, Merciful.(49:12)