Musnad Abu Ya'la al-Mawsili 155:295

Ubayd Allah ibn Umar narrated to us, Ali ibn Hashim narrated to us, Abd al-Salam ibn Ajlan narrated to us, from Abu Yazid al-Madini, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him) that he said: "Indeed, the runaway is returned," meaning the runaway camel.