(26) باب الْعُرَفَاءِ لِلنَّاسِ
Narrated `Urwa bin Az-Zubair:
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).
Reference: Sahih al-Bukhari 7176, 7177
In-book reference: Book 93, Hadith 40
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 89, Hadith 288