Insulting, mocking, or hurting another human being using our words or actions is considered a sin in Islam. However, as human beings, we are bound to make mistakes and sometimes may utter words or take actions that can insult others. Whether it is done knowingly or unknowingly, the best thing to do is to repent from it immediately. The Quran says: "As for those who abuse believing men and women unjustifiably, they will definitely bear the guilt of slander and blatant sin." (33:58). Therefore, it is recommended to be cautious and careful to avoid hurting others. However, if you've insulted another human being, knowingly or unknowingly, it's never too late to repent. Allah is indeed the most merciful and forgiving as long as you repent.
Good Etiquette Duas
Allaahumma fa'ayyumaa mu'minin sababtuhu faj'al thaalika lahu qurbatan 'ilayka yawmal-qiyaamati.
O Allah, whomever of the believers I have abused, give him the reward of a sacrificial slaughter for it on the Day of Resurrection.
The dua was reported to have been recited by the Prophet (ï·º) as narrated by Abu Huraira. The dua can be recited whenever you feel like you have insulted someone, which has led them to feel hurt. The Prophet (ï·º) has also said: Whoever is guilty of doing some wrong against a fellow human being, whether in regard to his honor or anything else, he should obtain his forgiveness before the Day of judgment, when there will be no money to pay or recompense for it. If he has any good deeds to his credit, they will be taken away from him to the extent of his wrongdoing. And if he has no good deeds, the sins of the wronged one will be taken and put on him. [Bukhari]