(Imam Bukhari narrates that) Sa'id bin Yahya bin Sa'id Al-Qurashi narrated to us, he said that my father narrated to us, he said: Abu Burdah bin Abdullah bin Abi Burdah narrated to us, from Burdah, from Abu Musa (may Allāh be pleased with him), he says that

the Companions said: O Messenger of Allāh! Which trait of Islam is most excellent? He said: That from whose tongue and hand other Muslims are safe.