Musnad Ahmad 33:57

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from al-Aswad ibn Qays, from Nabih, from Jabir: That the slain of Uhud were carried from their place, so the herald of the Messenger of Allah, peace and blessings of Allah be upon him, called out: "Return the slain to their resting places."