Imam Ali (AS) said, O people! There is no proof of Allah, the Glorified, on His earth greater than our Prophet, Muhammad (s), nor is there any wisdom more manifest than His book, the Glorious Quran and Allah, the Exalted, has not praised anyone from among you except he who holds fast to his rope and follows His prophet; and only he perishes, who perishes when he disobeys Him, goes against His commands and follows his vain desires. This is why the Almighty says ‘… let those who disobey His order beware lest an ordeal should afflict them or a painful chastisement befall them.