A man asked, "Messenger of Allah, which aspect of Islam is best?"He replied, "That the people are safe from his tongue and his hand."
حدثنا حسن بن موسى حدثنا ابن لهيعة حدثنا يزيد بن أبي حبيب أنه سمع أبا الخير يقول سمعت
إن رجلا قال يا رسول الله أي الإسلام أفضل قال من سلم الناس من لسانه ويده
Its isnad is sahih. Abu Khayr is Marthad bin Abdullah Yazani. The meaning of the hadith has already appeared at greater length through another route at 6487. See also 6515. As for his saying "which Islam," in a copy in the margin of K it reads "which Muslims."