Whoever says "SubhanAllah wa bihamdihi" a hundred times during the day, his sins are wiped away, even if they are like the foam of the sea. [Sahih al-Bukhari; #7:168, Sahih Muslim; #4:2071]
A palm tree is planted for the reciter [of the above] in Paradise. [at-Tirmidhi; 5:511, al-Hakim]
The Prophet Muhammad (peace be upon him) said: "Two words (subhanAllah wa bihamdihi) are light on the tongue, weigh heavily in the balance, and are loved by the Most Merciful One."