Al-Hujurat 49:11 يا ايها الذين امنوا لا يسخر قوم من قوم عسى ان يكونوا خيرا منهم ولا نساء من نساء عسى ان يكن خيرا منهن ولا تلمزوا انفسكم ولا تنابزوا بالالقاب بيس الاسم الفسوق بعد الايمان ومن لم يتب فاولايك هم الظالمون ١١

O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them; nor let women ridicule [other] women; perhaps they may be better than them. And do not insult one another and do not call each other by [offensive] nicknames. Wretched is the name [i.e., mention] of disobedience after [one's] faith. And whoever does not repent - then it is those who are the wrongdoers.