Musnad Ahmad 32:2060

Muhammad ibn Ja'far narrated to us, Sa'id narrated to us, from Qatadah, from Anas, that the Messenger of Allah (peace and blessings of Allah be upon him) performed Qunut for a month, supplicating against tribes of the Arabs: Ri'l, Banu Lihyan, 'Usayyah, and Dhakwan, during the morning prayer.