The Rule of Friday prayer through verses of The Quran and Traditions of Infallibles

There is no doubt about the importance of the Friday prayer in evolution of society and individuals. What is famous among people about the rule of Friday prayer is optional obligatory. It means that everybody can choose any of the two prayers: Friday prayer or the noon (zuhr) prayer in the noon of the day of Friday. But this paper proves that according to the verses and traditions of infallible Prophet and Imams، the duty of most of the people on Friday noon is only the Friday prayer and nothing else. If there is no Friday prayer or there are other excuses، Muslims must pray the noon prayer. This verdict can be one of the best keys for Cultural Revolution in Shiite society and making evolution in cultural، economic and political grounds in every society