From Sahih Bukhari (Hadith 6406):
Narrated Abu Huraira:The Prophet (ﷺ) said, "There are two expressions which are very easy for the tongue to say, but they are very heavy in the balance and are very dear to The Beneficent (Allah), and they are, 'Subhan Allah Al- `Azim and 'Subhan Allah wa bihamdihi
Reference: Bukhari 6406