It is narrated from Sayyiduna Mu'adh that the Prophet (peace and blessings be upon him) said: The true Muslim is the one from whose tongue and hand other Muslims are safe.
Hadith Referenceمسند احمد / مسند المكيين / 15635
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف مسلسل بالضعفاء