A person gave an article to another person to sell on his behalf. After the latter found a buyer, he went to the original owner and bought it for a lesser price,
(Part No. 13; Page No. 99) having guaranteed that it was going to be sold, but he did not tell its owner about the price it reached. Is this permissible?
If a person is a proxy for another one in selling an article, then a person comes to buy it for a certain price, then the former goes to the owner of the article and buys it for a lesser price, without telling the owner, this is impermissible, as it entails lying, betraying trust and harming the owner of the article.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.