Riyad as-Salihin, Book 18, Hadith 1582 (In-Book) ⓘ
Ibn 'Umar (May Allah be pleased with them) said: A man mentioned to the Messenger of Allah that he was often deceived in dealings. The Messenger of Allah said to him, "When you enter into a transaction you should say: "There should be no deception."'[Al-Bukhari and Muslim].
وعنه قال: ذكر رجل لرسول الله صلى الله عليه وسلم أنه يُخدع في البيوع فقال رسول الله صلى الله عليه وسلم: "من بايعت؟ فقل : لا خلابة" ((متفق عليه)). "الخِلابة" بخاء معجمة مكسورة، وباء موحدة: وهي الخديعة.