[Sahih Muslim : Book 1, Number 0161]
It is reported on the authority of Abu Huraira (Radi Allah Anhu) that the Messenger of Allah (sal-allahu- alleihi-wasallam ) observed: Avoid the seven noxious things. It was said (by the hearers): What are they, Messenger of Allah (sal-allahu- alleihi-wasallam ) ? He (the Holy Prophet (sal-allahu- alleihi-wasallam ) ) replied: Associating anything with Allah, magic, killing of one whom God has declared inviolate without a just cause, consuming the property of an orphan, and consuming of usury,turning back when the army advances, and slandering chaste women who are believers, but unwary.