It is narrated from Jabir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "No townsman should sell for a villager; leave the people alone, Allah provides sustenance to some through others."
Hadith Referenceمسند الإمام الشافعي / كتاب البيوع / 1360
Hadith Takhrijاخرجه مسلم البيوع، باب تحريم بيع الحاضر للبادي (1522)۔