Bismillahir Rahmanir Raheem
Assalamu 'Alaykum wa Rahmatullahi wa Barakatuhu
Bukhari :: Book 1 :: Volume 2 :: Hadith 38
Narrated Abu Huraira:
The Prophet Salla Allahu 'alayhi wa Sallam 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 receive the good tidings that you will be rewarded; and gain strength by worshipping in the mornings, the nights." (See Fath-ul-Bari, Page 102, Vol 1).