Hazrat Mohammad (S.A.W) Ne Farmaya:Allah Taalah Farmatay Hain,"Aulaad-E-Aadam Ka Har Amal 10 Guna Bharta Hai Siwaye Roze Ke,Roza Mere Liye Hai Aur Main He Roze Ki Jaza Doon Ga."(BUKHARI SHARIF)
also you can..