Quran

 49:11

يَا أَيُّهَا الَّذِينَ آمَنُوا لَا يَسْخَرْ قَوْمٌ مِنْ قَوْمٍ عَسَىٰ أَنْ يَكُونُوا خَيْرًا مِنْهُمْ وَلَا نِسَاءٌ مِنْ نِسَاءٍ عَسَىٰ أَنْ يَكُنَّ خَيْرًا مِنْهُنَّ ۖ وَلَا تَلْمِزُوا أَنْفُسَكُمْ وَلَا تَنَابَزُوا بِالْأَلْقَابِ ۖ بِئْسَ الِاسْمُ الْفُسُوقُ بَعْدَ الْإِيمَانِ ۚ وَمَنْ لَمْ يَتُبْ فَأُولَٰئِكَ هُمُ الظَّالِمُونَ ﴿١١﴾

11. O you who believe! No people shall ridicule other people, for they may be better than them. Nor shall any women ridicule other women, for they may be better than they. Nor shall you slander one another, nor shall you insult one another with nicknames. Evil is the return to wickedness after having attained faith. Whoever does not repent—these are the wrongdoers.