Sahih Bukhari Volume 001, Book 002,
Hadith Number 020.
Sahih Bukhari Book 02. Belief
Narated By Anas : The Prophet said,
"Whoever possesses the following
three qualities will taste the sweetness
of faith:
1. The one to whom Allah and His
Apostle become dearer than anything
else.
2. Who loves a person and he loves
him only for Allah's sake.
3. Who hates to revert to disbelief
(Atheism) after Allah has brought
(saved) him out from it, as he hates to
be thrown in fire."