Musnad Abu Ya'la al-Mawsili 160:224

Amr al-Naqid narrated to us, Ishaq bin Mansur narrated to us, Isra'il narrated to us, from Mu'awiyah bin Ishaq, from Sa'id al-Maqburi, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Permission has been granted to me to speak about an angel whose two feet have passed through the seventh earth, and the Throne is upon his shoulder. He is saying: 'Exalted are You, where were You, and where are You?'"