Musnad Abu Ya'la al-Mawsili 155:256

Husayn ibn al-Aswad narrated to us, Ibn Fudayl narrated to us, ‘Umarah narrated to us, from Abu Zur’ah, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Two words are light on the tongue, beloved to the Most Merciful, and heavy on the scale: 'Glory be to Allah and His praise' (Subhan Allah wa bi-hamdihi), 'Glory be to Allah the Almighty' (Subhan Allah al-‘Azim)."