It is narrated on the authority of Abu Musa Ash'ari:
I asked the Messenger of Allah which (attribute) of Islam is more excellent. Upon this he remarked: One in which the Muslims are safe, protected from the tongue and hand of (other Muslims).
Reference: Sahih Muslim 42 a In-book : Book 1, Hadith 70 USC-MSA web (English) : Book 1, Hadith 66 (deprecated)
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