The Messenger of Allah ﷺ said, "Do not go out to meet caravans in order to buy from them. A town-dweller must not sell on behalf of a desert-dweller. Do not harbor mutual hatred, do not envy one another, and do not artificially inflate prices in bidding. Be, as servants of Allah, brothers to one another."
حدثنا يزيد أخبرنا محمد عن أبي سلمة
قال رسول الله ﷺ لا تتلقوا الركبان للبيع ولا يبع حاضر لباد ولا تباغضوا ولا تحاسدوا ولا تناجشوا وكونوا عباد الله إخوانا