This Hadith has already been mentioned (Hadith No. 1591). Najsh means to offer a high price for something in order to allure another customer who is interested in the thing. If a person has no intention of purchasing a thing which is being auctioned, one should not give a higher bid for it because its genuine customer will be deceived by it, and he will purchase it at a higher price. This is also a form of deceit which must be strictly avoided.