The Quran

إِنَّ الَّذينَ يُؤذونَ اللَّهَ وَرَسولَهُ لَعَنَهُمُ اللَّهُ فِي الدُّنيا وَالآخِرَةِ وَأَعَدَّ لَهُم عَذابًا مُهينًا

Ali Unal

Those who affront God and His Messenger (through disrespect for Him in words and acts and for His Messenger and Islamic values), God certainly curses them (excludes them from His mercy) in this world and the Hereafter, and He has prepared for them a shameful, humiliating punishment.¹

The original word (which we have translated as affront) is adhā. It is mainly used to express any words that hurt another’s feelings. So the verse is warning us about any unbecoming words that we may utter concerning God and His Messenger, and Islamic values. The verse also forbids any disrespectful act toward God and His Messenger, and Islamic values.