The Book of Transactions (Kitab Al-Buyu`)

Muslim :: Book 10 : Hadith 3914

Abu Qatada al-Ansari (Allah be pleased with him) reported he heard Allah's Messenger (may peace be upon him) say: Beware of swearing; it produces a ready sale for a commodity, but blots out the blessing.

Source materials are from the University of Southern California MSA site
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