Volume 3, Book 34, Number 334:
Narrated Nafi:
Ibn ‘Umar told us that the people used to buy food from the caravans in the lifetime of the Prophet.
The Prophet used to forbid them to sell it at the very place where they had purchased it (but they
were to wait) till they carried it to the market where foodstuff was sold. Ibn ‘Umar said, ‘The Prophet
also forbade the reselling of foodstuff by somebody who had bought it unless he had received it with
exact full measure’
Volume 3 – 480 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 34: SALES AND TRADE