Sahih Muslim , Book 1, Hadith 70 (In-Book) ⓘ
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).
وَحَدَّثَنِي سَعِيدُ بْنُ يَحْيَى بْنِ سَعِيدٍ الأُمَوِيُّ، قَالَ حَدَّثَنِي أَبِي، حَدَّثَنَا أَبُو بُرْدَةَ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي بُرْدَةَ بْنِ أَبِي مُوسَى، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الإِسْلاَمِ أَفْضَلُ قَالَ " مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ " .
also referenced under: Hadith 42 (Reference) & Book 1, Hadith 66 (USC-MSA)