(48) باب مَا يُكْرَهُ مِنَ الْخِدَاعِ فِي الْبَيْعِ
Narrated `Abdullah bin `Umar:
A person came to the Prophet (ﷺ) and told him that he was always betrayed in purchasing. The Prophet (ﷺ) told him to say at the time of buying, "No cheating."
Reference: Sahih al-Bukhari 2117
In-book reference: Book 34, Hadith 70
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 328