Musnad Ahmad 32:1035

'Affan narrated to us, Sulaym ibn Akhdar narrated to us, he said: Ibn 'Awn narrated to us, he said: Hisham ibn Zayd ibn Anas narrated to me, from Anas: When the day of Hunayn arrived, and Hawazin and Ghatafan gathered a great multitude against the Messenger of Allah, may Allah bless him and grant him peace, while the Prophet, may Allah bless him and grant him peace, was with ten thousand or more, and with him were the Tulaqa' (those freed at the conquest of Mecca), they came with the livestock and the offspring. Then he mentioned the rest of the hadith.