Sahih Bukhari Volume 3, Book 41, Hadith Number 570.

Narated By Jabir bin ‘Abdullah : While I was in the company of the Prophet in one of his Ghazawat, he asked, “What is wrong with your camel? Will you sell it?” I replied in the affirmative and sold it to him. When he reached Medina, I took the camel to him in the morning and he paid me its price.