sentences:  The procedure is not explicitly mentioned in the Quran, however, it is a tradition established by Islam's prophet Muhammad directly (following Abraham), and so its practice is considered a "sunnah" (prophet's tradition) and is very important in Islam.For Muslims, circumcision is also a matter of cleanliness, purification and control over one's baser self ("nafs").There is no agreement across the many Islamic communities about the age at which circumcision should be performed.