Hadithcore
Musnad Ahmad 1676
sahih· Darussalam

It was narrated that ‘Abdur-Rahman bin ‘Awf said:

The Messenger of Allah (ﷺ) said: “I was present at the treaty of al-Mutayyabeen with my paternal uncles when I was a boy, and I would not like to have red camels in return for breaking (that deal).”

References1 variant
Arabic/English book
Book 10, Hadith 1676