Sunan an-Nasa'i, Volume 6, Book 47, Hadith 5002 (DarusSalam) ⓘ
It was narrated that Abu Musa said: "I said: 'O Messenger of Allah, whose Islam is most virtuous?' He said: 'The one from whose tongue and hand the Muslims are safe.'"
أَخْبَرَنَا سَعِيدُ بْنُ يَحْيَى بْنِ سَعِيدٍ الأُمَوِيُّ، عَنْ أَبِيهِ، قَالَ حَدَّثَنَا أَبُو بُرْدَةَ، - وَهُوَ بُرَيْدُ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي بُرْدَةَ - عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ قُلْنَا يَا رَسُولَ اللَّهِ أَىُّ الإِسْلاَمِ أَفْضَلُ قَالَ " مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ " .
also referenced under: Hadith 4999 (Reference) & Book 47, Hadith 15 (In-Book)