The Messenger of Allah ﷺ said, "There are three qualities, whoever possesses them will find the taste of faith." Bundar said, "the sweetness of faith." "Whoever loves a person solely for the sake of Allah, whoever finds Allah and His Messenger more beloved to him than anything else, and whoever would prefer to be cast into the fire rather than return to disbelief after Allah has rescued him from it."
حدثنا محمد بن المثنى ومحمد بن بشار قالا حدثنا محمد بن جعفر حدثنا شعبة قال سمعت قتادة يحدث
قال رسول الله ﷺ ثلاث من كن فيه وجد طعم الإيمان وقال بندار حلاوة الإيمان من كان يحب المرء لا يحبه إلا لله ومن كان الله ورسوله أحب إليه مما سواهما ومن كان أن يلقى في النار أحب إليه من أن يرجع في الكفر بعد إذ أنقذه الله منه
Bukhari narrated it in Iman, chapter "Whoever hates to return to disbelief," 6041, from the hadith of Shubah with this chain, and Muslim in Iman, chapter "Explaining the qualities of one who possesses them and finds the sweetness of faith," hadith 43/68, from Ibn Muthanna and Ibn Bashar with this chain.