As for the third principle - that truth is exclusive to this Ummah - it is a common ground agreed upon by us and our opponents, even if we may disagree in its reason.

Since the proof of the validity of consensus of the Ummah in our belief is the fact that no age can remain without an infallible Imam, who cannot possibly do a wrong, based on our proofs, therefore, truth does not leave this Ummah for the infallible entity is amongst us; and according to our opponent, on the virtue of the arguments they mention, it is concluded that consensus is a binding proof. Therefore, there is no need to occupy ourselves with proving this principle.

Having established these principles, the Imamate of the Master of the Age (aj) is proved; because everyone who believes that the Imam must be infallible is certain that he is the Imam. There is no one who believes in the Imam’s infallibility and questions his Imamate, except parties whose creed is demonstrated through irrefutable proofs, such as Kaisaniyya, Nawusiyya and Waqifa. When we disprove their claims, the Imamate of our Master is automatically proved.

Invalidity of Kaisaniyya creed: Arguments proving the invalidity of Kaisaniyya, who believe in the Imamate of Muhammad Ibn Al-Hanafiyyah, are many.

One is that if he were an Imam with ascertained infallibility, there must be explicit statements by the Messenger of Allah (S) and Amir al-Mu’minin, Imam ‘Ali Ibn Abi Talib (‘a) about him, because infallibility can only be determined through the statement of another infallible entity. However, the Kaisaniyya do not claim an explicit tradition with this regard. Instead, they rely on weak instances, which have led them to confusion, but are far from being explicit words. One is that Amir al-Mu’minin (‘a) granted him the standard on the battle of the Camel in Basra, and his saying, “You are truly my son,” while Hasan and Husayn (‘a) were also his sons. These instances do not establish his Imamate in any way, and rather, indicate his excellence and high position.

Besides, the Shi’a narrate that a conversation took place between him and ‘Ali Ibn Husayn (‘a) with respect to him being worthy of Imamate and they both invoked a rock to issue a verdict and the rock testified to the Imamate of ‘Ali Ibn Husayn (‘a). This humbled Muhammad Ibn Al-Hanafiyyah and he submitted to the position to his nephew and professed belief in his Imamate.