Seven Destructive Sins

The Prophet, sallAllaahu 'alayhi wa sallam, said: "Avoid the seven great destructive sins."  They (the people) asked, "O Allah's Messenger!  What are they?"  He said,

"To join partners in worship with Allah,

to practise sorcery;

to kill the life which Allah has forbidden except for a just cause (according to Islamic law);

to eat up Riba' (usury);

to eat up the property of an orphan;

to show one's back to the enemy and fleeing from the battle-field at the time of fighting and

to accuse chaste women who never even think of anything touching their chastity and are good believers."

[Bukhari 8:840, Narrated Abu Huraira, radhiAllaahu 'anhu]