Riyad as-Salihin, Book 18, Hadith 1512 (In-Book)

Abu Musa Al-Ash'ari (May Allah be pleased with him) reported: I asked the Messenger of Allah: "Who is the most excellent among the Muslims?" He said, "One from whose tongue and hands the other Muslims are secure."[Al-Bukhari and Muslim].

وعن أبي موسى رضي الله عنه قال‏:‏ قلت‏:‏ يا رسول الله أي المسلمين أفضل‏؟‏ قال‏:‏ ‏ "‏من سلم المسلمون من لسانه ويده‏" ‏‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

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