Book 30, Hadith 61

It was narrated from Abu Hurairah that the Messenger of Allah said:"Avoid the seven sins that doom one to Hell." It was said: "O Messenger of Allah, what are they?" He said: "Associating others with Allah (Shirk), magic, killing a soul whom Allah has forbidden killing, except in cases dictated by Islamic law, consuming Riba, consuming the property of orphans, fleeing on the day of the march (to battlefield), and slandering chaste women who never even think of anything touching their chastity and are good believers