Musnad Ahmad 38:2

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, and Hajjaj narrated to us, he said: Shu'bah narrated to me, he said: I heard Qatadah narrating from Zurarah—Hajjaj said in his narration: He said: I heard Zurarah—from Abd al-Rahman ibn Abza, from the Prophet, may God bless him and grant him peace: "That he used to perform Witr with 'Glorify the name of your Lord, the Most High' (Surah Al-A'la)."