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.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ الْحَلِفُ مَنْفَقَةٌ لِلسِّلْعَةِ مَمْحَقَةٌ لِلْبَرَكَةِ قَالَ ابْنُ السَّرْحِ لِلْكَسْبِ وَقَالَ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ