Musannaf Ibn Abi Shayba 21:229

Mu'awiyah ibn Hisham narrated to us, from 'Umar ibn Rashid, he said: Iyas ibn Salamah ibn al-Akwa' narrated to me, from his father, he said: I never heard the Messenger of Allah, may Allah bless him and grant him peace, begin a supplication without beginning it with: "Subhana Rabbi al-A'la al-'Ali al-Wahhab" (Glory be to my Lord, the Most High, the Exalted, the Bestower).