Two phrases are very dear to Allah, very light on the tongue and very heavy on the Scale of Merits (on the Day of Judgement).
These are: Subhan Allah wa Bihamdihi, Subhan Allahi Al-Adheem (Glory be to God and Praise be to him, Glory be to God, the Great/the Only One worthy of being Worshipped)
(Hadith - Bukari)