(318) Chapter: Abomination of Swearing in Transaction

Abu Hurairah (May Allah be pleased with him) said:
I heard the Messenger of Allah (ﷺ) saying, "Swearing produces a ready sale for a commodity, but blots out the blessing."

[Al-Bukhari and Muslim].

Commentary: What is meant here is that if a person takes an oath while offering a merchandise, he may succeed in selling a large quantity of it, but this is not a fair means of business because it increases the sale but robs the business of its blessings. Therefore, even if a person is perfectly right in his statement in respect of his merchandise, he should not take an oath to influence his customers.