A man displayed some goods in the market and swore by Allah that he had been offered so much for that, that which was not offered, and he said so, so as to cheat a Muslim. On that occasion the following Verse was revealed: "Verily! Those who purchase a small gain at the cost of Allah's covenant and their oaths (They shall have no portion in the Hereafter ..etc.)' (3:77)
Reference: Sahih al-Bukhari 2088 In-book : Book 34, Hadith 41 USC-MSA web (English) : Vol. 3, Book 34, Hadith 301 (deprecated)
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