Narrated Abu Musa: Some people asked Allah's Apostle, "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."
Hadith ReferenceSahih Bukhari / The Book of Belief (Faith) / Hadith: 11
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة