Sahih al-Bukhari 7176, 7177
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).
حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي أُوَيْسٍ، حَدَّثَنِي إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، عَنْ عَمِّهِ، مُوسَى بْنِ عُقْبَةَ قَالَ ابْنُ شِهَابٍ حَدَّثَنِي عُرْوَةُ بْنُ الزُّبَيْرِ، أَنَّ مَرْوَانَ بْنَ الْحَكَمِ، وَالْمِسْوَرَ بْنَ مَخْرَمَةَ، أَخْبَرَاهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ حِينَ أَذِنَ لَهُمُ الْمُسْلِمُونَ فِي عِتْقِ سَبْىِ هَوَازِنَ ‏
"‏ إِنِّي لاَ أَدْرِي مَنْ أَذِنَ مِنْكُمْ مِمَّنْ لَمْ يَأْذَنْ، فَارْجِعُوا حَتَّى يَرْفَعَ إِلَيْنَا عُرَفَاؤُكُمْ أَمْرَكُمْ ‏"‏‏.‏ فَرَجَعَ النَّاسُ فَكَلَّمَهُمْ عُرَفَاؤُهُمْ، فَرَجَعُوا إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَأَخْبَرُوهُ أَنَّ النَّاسَ قَدْ طَيَّبُوا وَأَذِنُوا‏.‏