Musnad Ahmad Hadith 1786

I was a merchant; I came for Hajj and came to al-"Abbas bin ‘Abdul-Muttalib to buy some goods from him, as he was also a merchant. By Allah, I was with him in Mina when a man came out of a tent nearby and looked at the sun. When he saw that it had passed its zenith, he stood up and prayed. Then a woman came out of that tent from which that man had come out, and she stood behind him to pray. Then a boy on the brink of adolescence came out of that tent and stood with him to pray, I said to al-"Abbas: Who is this, O ’Abbas? He said: This is Muhammad bin "Abdullah bin ‘Abdul-Muttalib, the son of my brother. I said: Who is this woman? He said: She is his wife, Khadeejah bint Khuwailid. I said: Who is this youth? He said: He is "Ali bin Abu Talib, the son of his paternal uncle. I said: What are they doing? He said: He is praying, and he claims that he is a Prophet, but no one follows him except his wife and this cousin of his, that young man. And he claims that the treasure of Chosroes and Caesar will be granted to him. He said: "Afeef - who was the paternal cousin of al-Ash"ath bin Qais - became Muslim after that and was a good Muslim, and he used to say: If Allah had guided me to become Muslim on that day, I would have been the third with "Ali bin Abu Talib (رضي الله عنه ).