Abdul Wahab bin 'Abdul Majeed al-Thaqaf عبد الوهاب بن عبد المجيد الثقفي · Wages (Kitab Al-Ijarah)

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.