Narrated Anas bin Malik (RA): that the Messenger of Allah (peace be upon him) said: “There are three things for which whomever has them, then he has tasted the sweetness of faith: The one for whom Allah and His Messenger are more beloved than anything else; whoever loves someone and he does not love him except for the sake of Allah, and whoever hates to return to disbelief after Allah has saved him from it, just as he hates to be thrown into fire.”
Jami` at-Tirmidhi, Book 40, Hadith 19