Musnad Ahmad 1118:26

'Abd al-Razzaq narrated to us, he said: Sufyan informed us, from Ibn Abi Layla, from a man, from Fadala ibn 'Ubayd: "That they were with the Prophet, peace and blessings of Allah be upon him, in a military expedition. He said: And among us were slaves, so he did not distribute [spoils] to them."