Musnad Ahmad 30:1930

'Affan narrated to us, Wuhaib narrated to us, Suhail narrated to us, from his father, from Abu Hurairah, that the Prophet, peace and blessings of Allah be upon him, said: "Do not hate one another, do not turn your backs on one another, do not envy one another, and be, O servants of Allah, brothers."