Light on the tongue, heavy on the scales

وعن أبي هريرة رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏
"‏كلمتان خفيفتان على اللسان، ثقيلتان في الميزان، حبيبتان إلى
الرحمن‏:‏ سبحان الله وبحمده، سبحان الله العظيم‏"
‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

Abu Hurairah رضي اللّه عنـه reported:

The Messenger of Allaah (ﷺ) said, "There are two statements that are light on the tongue to remember, heavy in the Scales and are dear to the Merciful: 'Subhan-Allaahi wa bihamdihi, Subhan-Allaahil-Azeem.'

[Glory be to Allaah & His is the praise, (and) Allaah, the Greatest is free from imperfection]'.

[Al-Bukhari & Muslim]

The reward of those who have a heavy scale is mentioned by Allaah سُبحانه وتعالى

 in His Noble Book:

فَأَمَّا مَن ثَقُلَتْ مَوَازِينُهُ

فَهُوَ فِي عِيشَةٍ رَّاضِيَةٍ
'Then as for him whose balance (of good deeds) will be heavy,

He will live a pleasant life (in Paradise).'

(Al-Qari'ah 101:6-7)