Musnad Ahmad 30:2975

Waki’ narrated to us, Shu’bah narrated to us, from Yazid ibn Khumayr, from a freed slave of Quraysh, who said: I heard Abu Hurayrah narrating to Mu’awiyah. He said: "The Messenger of Allah (peace and blessings of Allah be upon him) forbade that a man should pray until he girds himself." He said: And I heard him narrating to him, he said: "The Messenger of Allah (peace and blessings of Allah be upon him) forbade the selling of war spoils until they are divided." Shu’bah said: He said once: "And he knows what they are." He said: "And he forbade the selling of fruits until they are safe from every blight."