Musannaf Ibn Abi Shayba 3:4568

Abdullah ibn Numayr narrated to us, from Ubaydullah ibn Umar, from Nafi’, from Ibn Umar, that he used not to perform Qunut in the dawn prayer nor in the Witr prayer. When he was asked about Qunut, he said: "We do not know Qunut except as the lengthening of the standing and the recitation of the Quran."