Musnad Ahmad 1017:5

'Affan narrated to us, Mu'adh ibn Hisham narrated to me, my father narrated to me, from Qatadah, from 'Abdullah ibn Buraydah, from his father, that the Prophet of Allah, peace and blessings of Allah be upon him, said: "Do not call the hypocrite 'master' (sayyid), for if he is your master, you have angered your Lord."