Musnad Ahmad 1018:86

'Affan narrated to us, Abu 'Awanah narrated to us, from Abu Bishr, from Salam ibn 'Amr al-Yashkuri, from a man among the companions of the Prophet, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Your brothers, so do good to them, and seek their help against what overcomes you, and help them against what overcomes them."