A man told the Messenger of Allah ﷺ that he was being deceived in business transactions. The Messenger of Allah ﷺ then said: When you make a bargain, say: There is no attempt to deceive. So when the man made a bargain, he said: There is no attempt to deceive. (Using translation from Abū Dāʾūd 3500)

أَنَّ رَجُلًا ذُكِرَ لِرَسُولِ اللَّهِ ﷺ أَنَّهُ يَنْخَدِعُ فِي الْبُيُوعِ فَقَالَ رَسُولُ اللَّهِ ﷺ «إِذَا بِعْتَ فَقُلْ لَا خِلَابَةَ» قَالَ فَكَانَ الرَّجُلُ إِذَا ابْتَاعَ يَقُولُ لَا خِلَابَةَ