Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) narrates: In the Days of Ignorance I went out to Syria for trade. When I reached the nearest part of Syria, a man from the People of the Book met me and said: Is there among you a man who claims prophethood? I said: Yes. He said: Would you recognise his likeness if you saw it? I said: Yes. He took me into a house in which there were pictures, but I did not see the picture of the Prophet (peace and blessings be upon him). While I was in that state, a man from among them came to us and said: What are you (talking) about? We told him, and he took us to his house. As soon as I entered, I saw the picture of the Prophet (peace and blessings be upon him), and I saw another man holding the heel of the Prophet (peace and blessings be upon him). I said: Who is this man standing at his heel? He said: There has never been a prophet but that another prophet came after him, except this one, for there is no prophet after him; and this is the caliph after him. And it was the likeness of Sayyiduna Abu Bakr (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1524