Musnad Abu Ya'la al-Mawsili 7:11

Al-Abbas ibn al-Walid al-Narsi narrated to us, Bishr ibn al-Mufaddal narrated to us, Abd al-Rahman ibn Ishaq narrated to us, from al-Zuhri, from Muhammad ibn Jubayr ibn Mut'im, from his father, from Abd al-Rahman ibn Awf, who said: The Messenger of Allah (ﷺ) said: "I witnessed a young boy with my paternal uncles at the Alliance of the Perfumed Ones (Hilf al-Mutayyibin). I would not love to have red camels in exchange for breaking it."