Musnad Ahmad 30:535

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Ibn Abi Dhi'b, from Sa'id al-Maqburi, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, I have a right over Quraysh, and indeed Quraysh has a right over you: as long as they judge and act justly, and are entrusted and fulfill [the trust], and are asked for mercy and show mercy."