One of the most important topics of Imamate is the discussion about the way or ways of determining the Imam. Amidst, the best way of Imam determination has been the text which is accepted by the scholars of the Islamic sects. In the light of the implication clarity, text is divided into two types of “evident” and “hidden”. Evident text will prove the Imamate with no mediation; and so it has a special importance. In this research, the evident text on the immediate Imamate of the Commander of the Faithful (a) at the night of the Ascension will be investigated from the Sunni sources, and the accuracy of its document will be proved regarding their basic principles in the Hadith sciences. As this text is of evident text, the immediate Imamate of the Commander of the Faithful (a) will be proved by verifying the document accuracy and without enclosing any other prerequisite.