Jabir Ibn Yazid recounts: When Jabir Ibn Abdullah Ansari paid a visit to Ali Ibn Husain (a.s.) and was conversing with him, Muhammad Ibn Ali al-Baqir (a.s.) emerged from the ladies room while he was a small boy and a forelock was dropping on his forehead. The moment his eyes fell on him, Jabir trembled all over with every strand of hair on his body being raised in amazement. Jabir stared at him for a long time and then asked, ‘Son! Come forward’, he came forward. Then he said, ‘Go back’ and he duly obliged. Jabir exclaimed, ‘By the Lord of the Kaaba! His traits are exactly like those of the Prophet (s.a.w.s.).’ Jabir stood up and going near him, asked, ‘Son! What is your name?’ He replied, “Muhammad.” ‘Whose son?’ “Ali Ibn Husain” was the response. Jabir queried, ‘Son, may my life be sacrificed for you, are you al-Baqir?’ He replied in the affirmative and said, “Convey to me what you are carrying from the Messenger of Allah (s.a.w.s.).” Jabir responded, ‘O my master! The Messenger of Allah (s.a.w.s.) gave me glad tidings of survival till I meet you and convey his salutations to you. O my master! The Messenger of Allah (s.a.w.s.) conveys salutations to you!’ Abu Ja’far (a.s.) remarked, “O Jabir! May the salutations be on the Messenger of Allah (s.a.w.s.) till the heavens and the earth subsist. And may the salutations be on you for conveying the salutations.”
Thereafter, Jabir used to frequent him and learn things from him. Once, Imam Baqir (a.s.) asked him some question. At this, Jabir pleaded, ‘By Allah! I don’t intend to violate the prohibition of Allah’s Messenger (s.a.w.s.). For certainly, he has informed me that you are the Imams, the guides from his Ahle Bayt (a.s.) after him. The most forbearing of the people in childhood and the most knowledgeable of them in old age. And he warned, “Don’t teach them for they are more knowledgeable than you.” Hearing this, Abu Ja’far (a.s.) retorted, “Indeed my grandfather (s.a.w.s.) has spoken the truth. Certainly, I am more informed than you of what I asked you, as I have been granted wisdom in childhood. All this is due to the grace of Allah and His mercy upon us Ahle Bayt (a.s) Reference : Kamaluddin wa Tamamun Nemah Vol 1