Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن ابن عباس رضي الله عنهما قال: قال رسول الله صلى الله عليه وسلم : “لا تتلقوا الركبان، ولا يبع حاضر لباد" فقال له طاوس: ما قوله: لا بيع حاضر لباد؟ قال: لا يكون له سمسارًا. ((متفق عليه)).
The Messenger of Allah (ﷺ) said, "The caravans carrying merchandise should not be met on the way to purchase from them; a man in the city should not sell for a man of the desert."Tawus asked him (Ibn 'Abbas): "What do these words really imply?" He said: "He should not work as an agent on his behalf."[Al-Bukhari and Muslim].