Musannaf Ibn Abi Shayba 13:480

Abu Bakr narrated to us, he said: Ibn Abi Za’idah narrated to us, from Hajjaj, from Abu al-Zubayr, from Jabir, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Animals [exchanged] two for one is no problem, [provided it is] hand-to-hand. And there is no good in it [if it is] on credit."