"Sincere repentance is not merely the matter of words spoken on the tongue. Rather, the acceptance of repentance is subject to the condition that the person gives up the sin straight away, that he regrets what has happened in the past, that he resolves not to go back to the thing he has repented from, that he restores people’s rights or property if his sin involved wrongdoing towards others, and that he repents before the agony of death is upon him. Allah [Subhanahu wa Ta'ala] says (interpretation of the meaning): “Allah accepts only the repentance of those who do evil in ignorance and foolishness and repent soon afterwards; it is they whom Allahwill forgive and Allah is Ever All-Knower, All-Wise. And of no effect is the repentance of those who continue to do evil deeds until death faces one of them and he says: ‘Now I repent;’nor of those who die while they are disbelievers. For them We have prepared a painful torment” [The Qur'an 4:17-18]"