I was present when Abu Bakr died and Umar succeeded him. A Jew from Medina, who was a leader of Jews and whom the Jews considered to be the most knowledgeable person of the time, came to Umar and said: O Umar, I want to embrace Islam at your hands. If you can answer my questions, I would know that you are the most knowledgeable follower of this Book and Sunnah. Umar said: “I am not having this capability, but I will show you one who is the most knowledgeable about our Book and Prophet’s Sunnah and you can ask all you want from him and it is him.” And he pointed to Imam Ali (a.s)” The Jew said: O Umar, if it is as such as you say, what right do you have that people should pay allegiance to you while that person is most knowledgeable of you all? Umar told him to shut up and warned him. After that the Jew arose and came to Ali (a.s) and asked: “Are you like Umar has told?” Imam Ali (a.s) asked: what did Umar say? The Jew explained the situation to him and said: I will ask you some questions and I want to know whether anyone has asked you about them; and whether you are true in your claim that you are the best and the most knowledgeable of nation, so that I may also enter the fold of Islam. Imam Ali (a.s) said: Yes, I am as Umar has told you. Ask me whatever you like and I will answer, if Allah wills. The Jew said: I will ask you about three, three and one thing. Imam Ali (a.s) said: Why don’t you say: I’ll ask you about seven things? The Jew said: No, first I will ask you about three and if you give the right answers, I will ask you about another three and if you give the right answers, I will ask you the last one. If you fail to answer the first three, I will keep quiet and not ask you anything else. Imam Ali (a.s) said: Ask whatever you like. The Jew said: Which was the first stone to be placed on the earth, the first tree that has grew on the earth and the first fountain that flowed on the earth? Amirul Momineen (a.s) replied to all three questions. Then the Jew asked: How many Imams of guidance are there in this nation? In what position Muhammad would be in Paradise? Who would be with Muhammad in Paradise? Imam Ali (a.s) said: This nation has twelve guiding Imams from the progeny of the Prophet of this nation and they are from my descendants. The position of Muhammad (s) is in the best and the most honored location of the Garden of Eden. As for those from this nation, who would be in the company of the Messenger of Allah (s) are the same twelve from his progeny and their mother and their grandmother – mother of their mother and their progeny – no one else will share this.