"Beware of taking oaths a great deal when selling, for it may help you to make a sale but it destroys the blessing."
Sunan an-Nasa'i Book 44, Hadith 12
← Previous Hadith "There are three at whom Allah will not look on the Day of Resurrection, nor will He sanctify them, and theirs will be a painful torment: the one who does not give anything but he reminds (the recipient of his gift), the one who drags his Izar (below the ankles), and the one who sells his product by means of false oaths." (Sahih )

Sunan an-Nasa'i Book 44, Hadith 11 Next Hadith → "Taking oaths may help you to make a sale but it takes (blessing) away from the earnings "(Sahih )

Sunan an-Nasa'i Book 44, Hadith 13