Muhammad ibn Rafi' narrated to us, Muhammad ibn Abi Fudayk narrated to us, al-Dahhak — and he is Ibn 'Uthman — informed us, from Nafi', from 'Abdullah ibn 'Umar, that the Messenger of Allah, peace and blessings be upon him, said: "It is not lawful for a believer to shun his brother for more than three days."