164. Indeed Allah conferred a great favour on the believers when He sent among them a Messenger (Muhammad ) from among themselves, reciting unto them His Verses (the Qur'an), and purifying them (from sins by their following him), and instructing them (in) the Book (the Qur'an) and Al-Hikmah [the wisdom and the Sunnah of the Prophet (i.e. his legal ways, statements, acts of worship, etc.)], while before that they had been in manifest error.