The Almighty Allah has revealed the reply to your question...

The Almighty Allah has revealed the reply to your question and made you my confidant, because you brought faith in me before others did and you are the Siddiq Akbar.”[^4] The fifth tradition of the Holy Prophet (S) is related by His Eminence, Ali (a.s.) himself wherein the Messenger of Allah (S) said: “This Siddiq Akbar is Ali Ibn Abi Talib (a.s.).” The writer has refrained from quoting this tradition in full, although it is absolutely authentic and its reporter is Abu Ja’far al-Aqeeli.

The gist of this narration is that Holy Prophet (S) told His Eminence, Ali (a.s.) that on Judgment Day except for the four of us, no one would be astride a mount. A person from the Helpers (Ansar) got up and beseeched the Prophet to inform them who these four were. The Prophet replied: “One of these is myself. I shall be astride the Buraaq. And my brother Salih, the prophet shall be on the she-camel whose legs were severed. And my Uncle Hamza shall be stride the she-camel, Ghazba.

And my brother, Ali (a.s.) shall be on a she-camel of Paradise and the standard (Liwaul Hamd) shall be in his hand, and he would be calling out: ‘There is no god, except Allah. Muhammad is the Messenger of Allah (S).’ All the people would be saying that he is a proximate angel or a Messenger sent by Allah or a bearer of the throne (Arsh). An angel from inside the Arsh would reply: ‘O People!

This is neither a proximate angel, nor a Messenger sent or a bearer of the throne, this is Siddiq Akbar, Ali Ibn Abi Talib (a.s.).’” So far, we have mentioned the saying of the Holy Prophet (S). Now, one should also know that His Eminence, Ali (a.s.) has called himself by the title of Siddiq Akbar as apparent from the following traditions.

First Tradition : Maaza Adwiya reports that he heard Ali (a.s.) saying from the pulpit of Basra that he was the Siddiq Akbar.[^5] In the same way, in Sharh Tajrid of Allamah Qaushiji, on page 389, we see that Ali (a.s.) said to a huge crowd: “I am the Siddiq Akbar. I brought faith before Abu Bakr did.” It should be clear that Ali (a.s.) has not attributed something new to himself; it was exactly what Holy Prophet (S) had declared about him.

Second Tradition: Ibaad Ibn Abdullah says that His Eminence, Ali (a.s.) said: “I am the slave of Allah and the brother of the Messenger of Allah (S). I am Siddiq Akbar. Except me, one who calls himself Siddiq Akbar, is a blatant liar.