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
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Sunan Abi Dawud Book 24, Hadith 23 Next Hadith → The Prophet (ﷺ) said: A townsman must not sell for a man from the desert, even if he is his brother or father.

Abu Dawud said: Anas b. Malik said: It was said: A townsman must not sell for a man from the desert. This phrase carries a broad meaning. It means that the (the townsman) must not sell anything for him or buy anything for him.

Sunan Abi Dawud Book 24, Hadith 25