Salim, the freed salve of Abu Hudhaifa used to lead in prayer the early Muhajirin (emigrants) and the companions of the Prophet (ﷺ) in the Quba mosque. Among those (who used to pray behind him) were Abu Bakr, `Umar, Abu Salama, and Amir bin Rabi`a.
Sahih al-Bukhari Book 93, Hadith 39
← Previous Hadith The Prophet (ﷺ) appointed a man from the tribe of Bani Asad, called Ibn Al-Utabiyya to collect the Zakat. When he returned (with the money) he said (to the Prophet), "This is for you and this has been given to me as a gift." The Prophet (ﷺ) stood up on the pulpit (Sufyan said he ascended the pulpit), and after glorifying and praising Allah, he said, "What is wrong with the employee whom we send (to collect Zakat from the public) that he returns to say, 'This is for you and that is for me?' Why didn't he stay at his father's and mother's house to see whether he will be given gifts or not? By Him in Whose Hand my life is, whoever takes anything illegally will bring it on the Day of Resurrection by carrying it over his neck: if it is a camel, it will be grunting: if it is a cow, it will be mooing: and if it is a sheep it will be bleating!" The Prophet (ﷺ) then raised both his hands till we saw the whiteness of his armpits (and he said), "No doubt! Haven't I conveyed Allah's Message?" And he repeated it three times.

Sahih al-Bukhari Book 93, Hadith 38 Next Hadith → Marwan bin Al-Hakam and Al-Miswar bin Makhrama told him that when the Muslims were permitted to set free the captives of Hawazin, Allah's Messenger (ﷺ) said, "I do not know who amongst you has agreed (to it) and who has not. Go back so that your 'Urafa' may submit your decision to us." So the people returned and their 'Urafa' talked to them and then came back to Allah's Messenger (ﷺ) and told him that the people had given their consent happily and permitted (their captives to be freed).

Sahih al-Bukhari Book 93, Hadith 40