From Sahih Muslim (Hadith 166):
It is reported on the authority of Anas that the Messenger of Allah (ﷺ) said:There are three qualities for which any one who is characterised by them will relish the savour of faith: that he loves man and he does not love him but for Allah's sake alone; he is to whom Allah and His Messenger are dearer than all else; he who prefers to be thrown into fire than to return to unbelief after Allah has rescued him out of it
Reference: Muslim 166