Musnad Ahmad 27:1738

Abu Nu'aym narrated to us, Sufyan narrated to us, from Abdullah ibn Dinar, from Ibn Umar, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Aslam, may Allah keep it safe. And Ghifar, may Allah forgive it. And Usayyah disobeyed Allah and His Messenger."