"The Messenger of Allah ﷺ said: 'Verbally abusing a Muslim is immorality and fighting him is Kufr (disbelief).'"

قَالَ رَسُولُ اللَّهِ ﷺ سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ