Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, “There are two statements that are light for the tongue to remember, heavy in the Scales and are dear to the Merciful: `Subhan-Allahi wa bihamdihi, Subhan-Allahil-Azhim [Glory be to Allah and His is the praise, (and) Allah, the Greatest is free from imperfection)’.”
[Al-Bukhari and Muslim].