They asked, "Messenger of Allah, which aspect of Islam is best?"He replied, "That the Muslims are safe from his tongue and his hand."
قالوا: يا رسول الله، أي الإسلام أفضل؟ قال: من سلم المسلمون من لسانه ويده.
Bukhari related it in the Book of Faith (11), and Muslim in the Book of Faith (42), both from Saeed bin Yahya bin Saeed Qurashi, who said, Our father narrated to us, who said, Abu Burda bin Abdullah bin Abu Burda narrated to us, from Abu Burda, from Abu Musa, and he related it. Muslim also related it through another route, in which it reads, "Which of the Muslims is best?"