"Beware of swearing oaths when selling, for it may help you to make a sale but it destroys the blessing."' (Using translation from Ibn Mājah 2209)
قَالَ رَسُولُ اللهِ ﷺ إِيَّاكُمْ وَكَثْرَةَ الْحَلِفِ فِي الْبَيْعِ؛ فَإِنَّهُ يُنَفِّقُ ثُمَّ يَمْحَقُ