Jami` at-Tirmidhi Book 47, Hadith 363
“The Prophet was standing and delivering a Khutbah for us on one Friday, when a caravan arrived in Al-Madinah. So the Companions of the Messenger of Allah rushed off until only twelve men remained. Among them were Abu Bakr and Umar. And This Ayah was revealed: And when they see some merchandise or some amusement, they disperse headlong to it.”
“We were with the Messenger of Allah when Surat Al-Jumuah was revealed, so he recited it until he reached: And other among them who have not yet joined them, A man said to him: ‘O Messenger of Allah! Who are these people who have not yet joined us?’ But he did not say anything to him.” He said: “Salman was among us.” He said: “So the Messenger of Allah placed his hand upon Salman and said: ‘By the One in whose Hand is my soul! If faith were on Pleiades then men among these people would reach it.”’
“I was with my uncle when I heard Abdullah bin Ubayy bin Salul saying to his companions: Do not spend on those who are with the Messenger of Allah until they desert from him. If we return to Al-Madinah then the more honorable will expel the meaner among them. So I mentioned that to my uncle, then my uncle mentioned it to the Prophet. So the Prophet called for me to narrated it to him. Then the Messenger of Allah sent message to Abdullah bin Ubayy and his companions but they took an oath that they had not said it. So he did not believe me and he trusted what they said. I was struck with distress the likes of which I had not suffered before. So I just at in my house, and my uncle said to me: ‘You only wanted the Messenger of Allah to not believe you and hate you.’ Then Allah revealed: ‘When the hypocrites come to you’ So the Messenger of Allah sent for me, and he recites it and said: ‘Indeed Allah has verified the truth of what you said.’”