Sahih al-Bukhari 11
Book 2: Belief · Narrated by Abu Musa
Arabic
حَدَّثَنَا سَعِيدُ بْنُ يَحْيَى بْنِ سَعِيدٍ الْقُرَشِيِّ، قَالَ حَدَّثَنَا أَبِي قَالَ، حَدَّثَنَا أَبُو بُرْدَةَ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي بُرْدَةَ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى ـ رضى الله عنه ـ قَالَ قَالُوا يَا رَسُولَ اللَّهِ أَىُّ الإِسْلاَمِ أَفْضَلُ قَالَ " مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ ".
English translation
Narrated Abu Musa: Some people asked Allah's Messenger (ﷺ), "Whose Islam is the best? i.e. (Who is a very good Muslim)?" He replied, "One who avoids harming the Muslims with his tongue and hands
Reference: Sahih al-Bukhari 11, Book of Belief. English translation by Dr. Muhammad Muhsin Khan.