Behold, those who are bent on denying the truth and on turning others away from the path of God have indeed gone far astray.
An-Nisa (The Women) Verse 167
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."
Volume 1, Book 2, Number 10