The Messenger of Allah ﷺ said, "Do not go out to meet the incoming traders, do not bind up the udders to make them swell with milk, and let none of you call out bids to drive up the price for another."
وقال رسول الله ﷺ لا تستقبلوا ولا تحفلوا ولا ينعق بعضكم لبعض