Amirul Momineen (a.s) entered Masjidul Haraam accompanied by Imam Hasan (a.s) and leaning on Salman; and he sat down (in the Masjid). A man with an elegant appearance and dress nicely entered and saluted Amirul Momineen (a.s). His Eminence returned his salutations. He said, “O Amirul Momineen (a.s), I wish to ask you about three things. If you give me correct replies, I would know that those who claimed caliphate before you were false and that their world and hereafter are not safe. If you do not reply correctly, I will know that your path is the same as those who preceded you. Amirul Momineen (a.s) said: “Ask me whatever you like”. He asked: “When a person sleeps, where does his soul go? How does man remember one thing and forgets the other? Whom does a child resemble more, the paternal uncles or the maternal.” His Eminence told Imam Hasan (a.s): O Abu Muhammad, reply to him. And Imam Hasan (a.s) replied to him. The man said, “I bear witness that there is no god except Allah and I have always borne witness thus. And I bear witness that Muhammad is the Messenger of Allah and I have always testified to it. And I bear witness that you are the legatee of the Messenger (s), and one who establishes his proof and evidence (pointing towards Amirul Momineen (a.s) he said, “I have always testified this.” Then gesturing to Imam Hasan (a.s), he said, “I bear witness that you are the legatee of Amirul Momineen (a.s) and one who shall establish his proof and evidence. That is you and the one who proves the prophethood of the Messenger of Allah (s). And I bear witness that Husain bin Ali (a.s) is the legatee of his brother and he is the one to establish the proof after him. And I bear witness that Ali bin Husain (a.s) is the Imam after Husain (a.s). And I bear witness that Muhammad bin Ali (a.s) is the Imam after Ali bin Husain (a.s). And I bear witness that Ja’far bin Muhammad (a.s) is the Imam after Muhammad bin Ali (a.s). And I bear witness that Musa bin Ja’far (a.s) is the Imam after Ja’far bin Muhammad (a.s). And I bear witness that Ali bin Musa (a.s) is the Imam after Musa bin Ja’far (a.s). And I bear witness that Muhammad bin Ali (a.s) is the Imam after Ali bin Musa (a.s). And I bear witness that Ali bin Muhammad (a.s) is the Imam after Muhammad bin Ali (a.s). And I bear witness that Hasan Ibn Ali (a.s) is the Imam after Ali bin Muhammad (a.s). After that I bear witness that that person is the Divine Proof, who is the son of Hasan bin Ali , whose name and patronymic (Kunniyat) will not be revealed till the time he fills the earth with justice and equity, like it would have been fraught with injustice and oppression. And peace be on you, O Amirul Momineen (a.s)!” After that he arose and departed from there. His Eminence told Imam Hasan (a.s), “O Aba Muhammad, go and see where he goes.” Imam Hasan (a.s) went out and returned after a moment and said, “He placed one foot outside the Masjid and after that I don’t know where he disappeared.” Amirul Momineen (a.s) said, “O Aba Muhammad, do you know who it was?” Imam Hasan (a.s) replied “Allah, His Messenger and Amirul Momineen (a.s) know better.” Ali (a.s) said, “He was Khizr.” So far we have only mentioned some reports (on this topic) and if we mentioned all reports narrated through Shia on this subject, this book would definitely become very long. We have only mentioned traditions on this subject accepted by both sects of Shia and Sunni. If anyone wishes to study all the reports on this matter, he may refer to books on this subject. In that case a large number of reports would create certainty.