The Prophet (ﷺ) forbade to bid against one another.
Sunan Abi Dawud Book 24, Hadith 23
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Do not go our to meet what is being brought (to market for sale). If anyone does so and buys some of it, the owner of merchandise has a choice (of canceling the deal) when it comes to the market.
Abu 'Ali said: I heard Abu Dawud say: Sufyan said: none of you must buy in opposition to one another ; that is he says: I have a better one for ten (dirhams).
Sunan Abi Dawud Book 24, Hadith 22 Next Hadith → The Messenger of Allah (ﷺ) forbade a townsman to sell for a man from the desert. I asked: What do you mean by the selling of a townsman for a man from the desert ? He replied: He should not be a broker for him.
Sunan Abi Dawud Book 24, Hadith 24
Abu 'Ali said: I heard Abu Dawud say: Sufyan said: none of you must buy in opposition to one another ; that is he says: I have a better one for ten (dirhams).
Sunan Abi Dawud Book 24, Hadith 22 Next Hadith → The Messenger of Allah (ﷺ) forbade a townsman to sell for a man from the desert. I asked: What do you mean by the selling of a townsman for a man from the desert ? He replied: He should not be a broker for him.
Sunan Abi Dawud Book 24, Hadith 24