Volume 3, Book 41, Number 590:
Narrated Ibn ‘Umar:
A man came to the Prophet and said, “I am often betrayed in bargaining.” The Prophet advised him,
“When you buy something, say (to the seller), ‘No deception.” The man used to say so afterwards.
Volume 3 – 545 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 41: LOANS, PAYMENT OF LOANS, FREEZING OF PROPERTY, BANKRUPTCY