Ibn 'Umar (May Allah be pleased with them) said:
A man mentioned to the Messenger of Allah (ﷺ) that he was often deceived in dealings. The Messenger of Allah (ﷺ) said to him, "When you enter into a transaction you should say: "There should be no deception."'[Al-Bukhari and Muslim]. (IT)
App reference (IT): Book 18, Hadith 72 (IT)
Arabic/English book reference (IT): Book 18, Hadith 1582 (IT)