Quran

[29:46] Do not argue with the people of the scripture (Jews, Christians, and Muslims) except in the nicest possible manner - unless they transgress - and say, "We believe in what was revealed to us and in what was revealed to you, and our god and your god is one and the same; to Him we are submitters."




[31:18-19] "You shall not treat the people with arrogance, nor shall you roam the earth proudly. GOD does not like the arrogant showoffs. "Walk humbly and lower your voice - the ugliest voice is the donkey's voice."

[4:148] GOD does not like the utterance of bad language, unless one is treated with gross injustice. GOD is Hearer, Knower.

[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.

[41:34] Not equal is the good response and the bad response. You shall resort to the nicest possible response. Thus, the one who used to be your enemy, may become your best friend