Amr bin Alī Abū Hafs narrated to me, he said I heard Mu’ādh bin Mu’ādh saying, I said to Awf bin Abī Jamīlah ‘Indeed Amr bin Ubayd narrated to us on authority of al-Hasan that the Messenger of Allah, peace and blessings of Allah upon him, said: ‘Whoever carries arms against us then he is not from us’. said ‘Amr lied, by Allah. Rather he intended it as a way to permit his filthy opinion.’
Sahih Muslim · Introduction