“I once asked abu al-Hassan, Alayhi al-Salam, about the case of a man who has made a vow and commitment that if Allah makes his wish to come true, he will pay a certain amount of dirham as charity. Allah then made his wish come true. He then made the dirham into gold and has sent to you; if that is sufficient or he has to do it again. He (the Imam) said, ‘He must do it again.’”