The Grave Sins

The Prophet (SAWA) said, 'The grave sins are: associating anything with Allah, insolence to one's parents, murdering an innocent soul, and taking an immoral or licentious oath.

Imam Ali (AS), when asked about the gravest of the grave sins, said, 'Feeling secure from Allah's plan, giving up all hope of Allah's munificence, and despairing of Allah's mercy.

Imam al-Sadiq (AS) said, 'There are seven grave sins: intentionally killing a believer, falsely accusing a chaste woman of fornication, fleeing from the midst of a battle, returning to a state of renegation after belief [This includes apostasy as well as a mere return to ones previous state of heedlessness and complacency after having believed (ed.)], unjustly usurping the property of the orphan, devouring usury after knowledge of its prohibition, and everything else that Allah has threatened to requite with obligatory punishment in the Fire.