Abdullah bin Umar reported,

There was a man who used to be cheated in business transactions. The Prophet ﷺ said to him, "When you make a deal, say, 'No deception.'" So he would say it.

Bukhari 2414

Sahih

حدثنا موسى بن إسماعيل حدثنا عبد العزيز بن مسلم حدثنا عبد الله بن دينار قال سمعت

ابن عمر رضي الله عنهما قال

كان رجل يخدع في البيع فقال له النبي ﷺ إذا بايعت فقل لا خلابة فكان يقوله

البخاري 2414صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Disputes
Chapter
Whoever sells on behalf of a weak person or the like, gives him the price, and instructs him to spend properly and manage his affairs, for if he acts wastefully after being forbidden, because the Prophet ﷺ forbade wasting wealth and said to the one who was deceived in transactions, "When you make a sale, say no cheating." And the Prophet ﷺ did not take away his wealth
Numbering
Darussalam 2414
Bukhari 2414