Suwayd bin Qays al-Tajibi سويد بن قيس التجيبي · Commercial Transactions (Kitab Al-Buyu)

I heard Messenger of Allah (ﷺ) say: Swearing produces a ready sale for a commodity but blots out the blessing. The narrator Ibn al-Sarh said: "for earning". He also narrated this tradition from Sa'id b. al-Musayyab on the authority of Abu Hurairah from the Prophet (ﷺ).