Ibn Mas`ud (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, "Reviling a Muslim is Fusuq (disobedience of Allah) and killing him is (tantamount to) disbelief."[Al-Bukhari and Muslim].
Commentary:
"Killing him is (tantamount) to disbelief" means that in terms of sin and prohibition, it is akin to Kufr. This Hadith makes the severity of this crime abundantly clear.
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