Musannaf Ibn Abi Shayba 3:4497

Shababa narrated to us, he said: Shu'bah narrated to us, from Qatadah, from Zurarah ibn Awfa, from Imran ibn Husayn, that the Prophet (peace and blessings of Allah be upon him) used to perform Witr with "Glorify the name of your Lord, the Most High."