The Prophet ﷺ said, "There are three qualities, whoever possesses them will taste the sweetness of faith. That Allah and His Messenger are more beloved to him than anything else, that he loves a person only for the sake of Allah, and that he hates to return to disbelief after Allah has rescued him from it just as he would hate to be thrown into a blazing fire."
حدثنا عبد الوهاب حدثنا أيوب عن أبي قلابة
أن النبي ﷺ قال ثلاث من كن فيه وجد بهن حلاوة الإيمان أن يكون الله ورسوله أحب إليه مما سواهما وأن يحب المرء لا يحبه إلا لله وأن يكره أن يعود في الكفر بعد إذ أنقذه الله منه كما يكره أن يوقد له نار فيقذف فيها
Its isnad is sahih. Bukhari narrated the hadith 1/60 no. 9 in Fath, in the Book of Faith, chapter on the sweetness of faith, and Muslim 1/66 no. 43 with similar wording, and Tirmidhi 5/15 no. 2624, saying, hasan sahih, and Nasai 8/96 no. 4988, and Ibn Majah 2/1338 no. 4033.