Musnad Ahmad 10:21

Isma'il narrated to us, Ibn Ishaq—meaning Abd al-Rahman—narrated to us, from al-Zuhri, from Muhammad ibn Jubayr, 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), and I would not love to have red camels in exchange for breaking it."