'I was with Abu 'Abdillah [al-Sadiq] (AS), and there was with him a man from al-Mughiriyyah. The man asked him about some practices. He said, 'There is nothing which the offspring of Adam needs except that it has been expounded in the practices set by Allah and His Messenger. Otherwise He would not have the argument over us that he holds.' The man from al-Mughiriyyah then asked, 'And what is His argument?' Abu 'Abdillah (AS) said, '[It is ] His verse: Today I have perfected your religion for you, and I have completed My blessing upon you.?