Musnad Abu Ya'la al-Mawsili 152:171

Abu Khaythama narrated to us, Yahya ibn Sa'id al-Qattan narrated to us, al-Taymi narrated to us, from Abu 'Uthman, from Ibn Mas'ud: That the Prophet, peace and blessings of Allah be upon him, forbade meeting the merchandise [before it reaches the market].