SHAFAQNA – When Ayah 2 of Surah Al-Maedah was sent down to the Prophet (PBUH), a man came to the prophet (PBUH) and said: O’ the prophet Of Allah (SWT), I have a question. Before asking his question, the Prophet (PBUH) said: Do you want to ask about sin (vice)? The man replied: Yes. Then the Prophet (PBUH) explained: “A bad deed is the one that your heart does not accept. God has given human being a heart that is bonded to good deeds and is stranger to bad deeds”. Then the Prophet (PBUH) touched the man’s chest with two of his fingers and said: ” Ask your heart, as people say ask Mojtahid, ask it (heart), ask for the Fatwa of your heart as the heart is a source of imitation (Taqleed) and also ask the piety from your conscience .”
 Martyr Motahhari Collection, Vol. 21, page 256.