(27) باب مَا يُكْرَهُ مِنَ الْحَلِفِ فِي الْبَيْعِ
Narrated `Abdullah bin Abu `Aufa:
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 reference: Book 34, Hadith 41
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 301