What are the Kalimahs that most weighty in Reward?

Rasulullah ( Sallaaho alaihi wasallam) said, 

"There are two kalimahs which are very light for the tongue (i.e. easy to utter) but very weighty in reward and very pleasing to Allah: These are  

 سُبْحَانَ اللَّهِ وَبِحَمْدِهِ، سُبْحَانَ اللَّهِ العَظِيم      

   

                 (Glory to Allah with all praises, glory to Allah, the majestic) 

Light for the tongue means that these kalimahs are so brief that no time is spend in there recitation and no difficulty is experienced in memorizing them.

In spite of them being so easy they will be found very weighty when good deeds will be weighed. Then the fact that they are dear to Allah more than anything else surpasses all other advantages. Imam Bukhari (Rahamatullah alaih) concluded his book “Sahih Bukhari” with these two kalimahs and the above mentioned hadith was given at the end of the book. According to one hadith, Rasulallah ( Sallallaho alaihi wassallam) had said, “None of you should miss earning one thousand virtues 

every day. Hymn (  سُبْحَانَ اللّهِ وَ بِحَمْدِهِ    ) one hundred times and you will get one thousand virtues through Allah’s grace, your daily sins will be less than this number. Then the reward of your good deeds, other than reciting this kalimah, will be in addition.” According to 

another hadith a person who recites (  سُبْحَانَ اللّهِ وَ بِحَمْدِهِ    ) one hundred times in the morning and in the evening has all his sins forgiven, even if they exceed the foam on the sea. It is

 stated in one hadith that recitation of (  

  سُبْحَانَ اللَّهِ وَالْحَمْدُ لِلَّهِلاَ إِلَهَ إِلاَّ اللَّهُ وَاللَّهُ أَكْبَرُ) causes the sins to fall off like the leaves of the trees (during the winter season).

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