Imam Ja‘far al-Ṣadiq (as): 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 , 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. al-Kāfī