It is (exclusively) meant for Me and I (alone) will reward it. Fasting is a shield.
http://www.gowister.com/hadith/muslim/2692/
a good deed receiving a tenfold to seven hundredfold reward. Allah, the Exalted and Majestic, has said: With the exception of fasting, for it is done for Me and I will give a reward for it,
http://www.gowister.com/hadith/muslim/2693/
said: Fast (is exclusively) meant for Me and I would give its reward. There are two (occasions) of joy for the observer of fast.
http://www.gowister.com/hadith/muslim/2694/
A hadith like this is narrated on the authority of Abu Sinan with the same chain of transmitters (and the words are): " As he meets Allah, He rewards him, and he is happy." - Grade: Sahih
http://www.gowister.com/hadith/muslim/2695/
and used to say: Do as many deeds as you are capable of doing, for Allah will not become weary (of giving you reward), but you would be tired (of doing good deeds) ;
http://www.gowister.com/hadith/muslim/2709/
there is for you ten times for every good and that is perpetual fasting (for three days would bring a reward for full thirty days).
http://www.gowister.com/hadith/muslim/2717/
so observe fast and break it, pray and sleep and observe fast for one day during the ten days, and there is a reward for you (for other) nine (days besides the tenth day of the fast).
http://www.gowister.com/hadith/muslim/2720/
If you do like that, your eyes would be highly strained and would sink and lose sight. There is no (reward for) fasting (for him) who fasts perpetually.
http://www.gowister.com/hadith/muslim/2722/
'Abdullah b. Amr (Allah be pleased with them) reported that the Messenger of Allah (saws) had said to him: Observe fast for a day and there would be reward for you for the rest (of the days).
http://www.gowister.com/hadith/muslim/2728/
Would you be able to afford (the sacrificing) of a goat? I (Ka'b) said: Then this verse was revealed:" Com- pensation (in the form of) fasting or alms or a sacrifice.
http://www.gowister.com/hadith/muslim/2869/