SubhanAllah or SubhanAllah wa bihamdihi (“I praise Allah (or All praise if to Allah) above all attributes that do not suit His Majesty.”)

Reward: A tree will be planted for you in Paradise. Nice! Start growing your own forest right now! Another hadith relates that whoever says this 100 times a day, his/her sins will be forgiven even if they were as much as the foam of the sea [Bukhari].