Quran 49:10 — The Walls (Al-Hujurat)

The believers are members of one family; you shall keep the peace within your family and reverence GOD, that you may attain mercy.

[49:9] If two groups of believers fought with each other, you shall reconcile them. If one group aggresses against the other, you shall fight the aggressing group until they submit to GOD's command. Once they submit, you shall reconcile the two groups equitably. You shall maintain justice; GOD loves those who are just.

[49:11] O you who believe, no people shall ridicule other people, for they may be better than they. Nor shall any women ridicule other women, for they may be better than they. Nor shall you mock one another, or make fun of your names. Evil indeed is the reversion to wickedness after attaining faith. Anyone who does not repent after this, these are the transgressors.