Sunan Ibn Majah 3940
سنن ابن ماجه#3940SahihIt was narrated from Abu Hurairah that the Prophet (ﷺ) said:“Verbally abusing a Muslim is Fusuq (disobedience) and fighting him is Kufr (ungratefulness to Allah).”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Fouad Abd al-BaqiHasan Sahih
Zubair Ali ZaiSahih
In-book reference: 36:15