´It was narrated that 'Abdullah said:` "The Messenger of Allah (ﷺ) said: 'Verbally abusing a Muslim is immorality and fighting him is Kufr (disbelief).'"
Hadith ReferenceSunan Ibn Majah / The Book of the Sunnah / Hadith: 69
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري