Musnad Ahmad 30:2010

Hawdha narrated to us, 'Awf narrated to us, from Khallas, who said: Abu Hurayrah said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The people are followers of Quraysh in this matter; their disbelievers are followers of their disbelievers, and their Muslims are followers of their Muslims."