´It was narrated from Ibn Mas’ud that the Messenger of Allah (ﷺ) said:` “Verbally abusing a Muslim is Fusuq disobedience and fighting him is Kufr (ungratefulness to Allah).’”
Hadith ReferenceSunan Ibn Majah / Chapters on Tribulations / Hadith: 3939
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه