Hadith: There are two words that are light on the tongue, heavy on the scale, and dear to the Most Merciful

عن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال:
«كَلِمَتَانِ خَفِيفَتَانِ عَلَى اللِّسَانِ، ثَقِيلَتَانِ فِي الْمِيزَانِ، حَبِيبَتَانِ إِلَى الرَّحْمَنِ: سُبْحَانَ اللهِ الْعَظِيمِ، سُبْحَانَ اللهِ وَبِحَمْدِهِ».
[صحيح] - [متفق عليه] - [صحيح البخاري: 6406]

Abu Hurayrah (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) said:
"There are two words that are light on the tongue, heavy on the scale, and dear to the Most Merciful: subhān Allah al-‘azhīm (glory be to Allah, the Majestic), subhān Allah wa bihamdih (glory and praise be to Allah)."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 6406]

Explanation

The Prophet (may Allah's peace and blessings be upon him) told about two words that the tongue utters without effort and in any condition, they bring great reward when weighed on the scale, and the Most Merciful Lord loves them:
Glory be to Allah, the Majestic; glory and praise be to Allah. This is because these two words contain attributes of greatness and perfection of Allah Almighty and exalting Him far above defects and imperfections.