It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that he said: "The Messenger of Allah (peace and blessings be upon him) forbade that a Muhajir (town-dweller) should sell on behalf of a Bedouin (villager)."
No one narrated this hadith from Qatadah (may Allah have mercy on him) except Sa'id bin Abi Arubah (may Allah have mercy on him), and Sadaqah bin Abdullah (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الألف / 199
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 6869»