By Hadith In Ghadir Khum, when Ali was appointed Imamate, verse 5:3 was revealed, which expresses that the religion had become perfect because of the appointment of Ali to Imamate. and obedience to him had become obligatory upon Muslims. Hadith of Two Weighty Things reflects the proximity of the Imams to the Quran. Addressing Hussain, the prophet said:" you are Imam, the son of the Imam, the brother of the Imam, nine of your lineal descendants will be pious Imams, the ninth of them being their Qa'im. The Shia scholar 'Allamah Kashif al-Ghita said about the Imamah: "Imamah is a divine station, just like Nubuwwah. Just as Allah chooses whomsoever He wants to for Nubuwwah and Risalah … similarly, for Imamah, too, He selects whomsoever He wishes." By reason Al-Baqir states that while people need a guide for their journey to a strange place, their journey to heaven is stranger and more in need of a guide. Al-Mufid states that an Imam is necessary for defining the exact laws that are obligatory upon the Muslims. Many verses in Quran are ambiguous, revelation of Quran without further explanation is unlikely from Allah. While Imamate brings the people nearer to obedience and away from disobedience, it is Grace (Lutf) that is incumbent of Allah. Regarding rejecting the Imamah-doctrine, , writes: "Imamah is a universal grace (lutf ‘amm) while Nubuwwah (prophethood) is a special grace (lutf khass), it is possible that a specific period in time can be void of a living Nabi while the same is not true for the Imam. To reject universal grace is worse than to reject any special grace. The prophet founded an eternal Shari'ah for all the times and this eternal religion could not continue without a leader. History In the period of Minor Occultation, theologians like Ibn Qube Razi, Newbakhtis, al-Shaykh al-Mufid, Seyyed Morteza and al-Shaykh al-Tusi rebuild the theological school of Imamiyah. In the second and third century of Hijra, a Ma'sum (infallible) and divinely chosen leader of the religion was more focused than the political role of the Imams by the theologians. Although Imamiyah believed that most of the works on the early Islamic centuries argue that Shi'ism began as a political movement rather than a religious group. However this does not mean that religious sentiments were absent in the first century. Dakake believes that the doctrine of Imamate was established in the time