It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: There are three things, whoever possesses them will taste the sweetness of faith: First, that Allah and His Messenger are more beloved to him than anyone else; second, that when he loves someone, he loves him only for the sake of Allah; and third, that after being saved from disbelief, he dislikes returning to it just as he would dislike being thrown into the fire.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 12002