عن أنس رضي الله عنه قال‏:‏ نهى رسول الله صلى الله عليه وسلم أن يبيع حاضر لباد وإن كان أخاه لأبيه وأمه‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

Anas bin Malik (May Allah be pleased with him) said

The Messenger of Allah (ﷺ) 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]