Seven Deadly Sins
The early Roman Catholic Church divided sins into those which could be forgiven (venial sins) and capital sins which would result in eternal damnation unless confessed during the sacrament of Confession. Capital sins were known as Deadly Sins because they could have a fatal effect on an individual’s soul.
The Seven Deadly Sins were formalised by Pope Gregory the Great in the 6th Century, although the concept of major human vices dated back to Greek times. They were, from most serious to least: pride, envy, anger, sadness, avarice, gluttony, and lust.
In 1589, Peter Binsfeld paired each of the Seven Deadly Sins with a demon, who tempted people by means of the associated sin. According to Binsfeld's Classification of Demons, the pairings are as follows: Lust: Asmodeus, Gluttony: Beelzebub, Greed: Mammon, Sloth: Belphegor, Wrath: Satan, Envy: Leviathan and Pride: Lucifer.
The Roman Catholic Church also recognizes seven holy virtues which correspond to each of the seven deadly sins. Vice: Virtue, Lust: Chastity, Gluttony: Temperance, Greed: Charity, Sloth: Diligence, Wrath: Forgiveness, Envy: Kindness and Pride: Humility.
Seven Deadly Sins in "Supernatural"
The Seven Deadly Sins are a group of seven demons that appear in the season three episode 3.01 The Magnificent Seven. Despite having significant powers, they are only black-eyed demons, though possess special powers unique to themselves. Because of these powers, they were originally imprisoned deep in Hell close to Lilith, unable to get out before the Gates of Hell were opened at the season two finale.
Lust possesses a young lady. Due to her nature she likes to have fun with her victims, before killing them. Lust is captured by Dean and later exorcised by Bobby Singer. Her meatsuit survives.
Pride possesses a young man. He claims to be the root of all sin. He is also assumed to be the leader of the Seven Deadly Sins since he is seen shouting out orders to them. He too is killed by Ruby with her demon-killing knife.
Gluttony possess a bald, skinny man. He forces Isaac to drink Drano (drain cleaner) thus killing him. He is later killed by Ruby with her demon-killing knife.
Sloth possesses an overweight man. He kills a family by making them too lazy to get up and eat when their hungry when the food was only a few feet away. Sloth goes after Bobby Singer but is drawn into a Devil's Trap and exorcised. His meatsuit survives.
Wrath possesses an bald, pierced, tattooed man. He exclaims his distaste at being around hunters. He later possess Isaac's dead body as a means to infiltrate Tamara's house where the Winchester brothers and Bobby were staying at. Wrath was later stabbed with Palo Santo and exorcised by Bobby.