Bukhari Collection: ::Book Number 3:: Hadith # 775
Narrated Jabir bin `Abdullah:I sold a camel to the Prophet on one of the journeys. When we reached Medina, he ordered me to go to the Mosque and offer two rak`at. Then he weighed for me (the price of the camel in gold) and gave an extra amount over it. A part of it remained with me till it was taken by the army of Sham on the day of Harra."