Narrated Abu Hurairah رضي الله عنه: The prophet Mohammad 
said
"Religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So you should not be extremists, but try to be near to perfection and recieve the good tidings that you will be rewarded; and gain strength by offering the prayers in the mornings, afternoons and during the last hour of nights."
(sahih Bukhari)
