Musnad Ahmad 32:1780

Aswad ibn Amir narrated to us, Shu'bah narrated to us, from Musa ibn Anas ibn Malik, from his father: "The Prophet, peace and blessings of Allah be upon him, performed Qunut for a month, supplicating against Ri'l, Dhakwan, and 'Usayyah, for they disobeyed Allah and His Messenger."