Riyad as-Salihin, Book 18, Hadith 1775 (In-Book) ⓘ
Anas bin Malik (May Allah be pleased with him) said: The Messenger of Allah forbade that a person in the city should make a deal on behalf of a villager on commission even if he is his real brother."[Al-Bukhari and Muslim]
عن أنس رضي الله عنه قال: نهى رسول الله صلى الله عليه وسلم أن يبيع حاضر لباد وإن كان أخاه لأبيه وأمه. ((متفق عليه)).