Good Manners and Form (Al-Adab)
Ṣaḥīḥ al-Bukhārī 6041
لاَ يَجِدُ أَحَدٌ حَلاَوَةَ الإِيمَانِ حَتَّى يُحِبَّ الْمَرْءَ، لاَ يُحِبُّهُ إِلاَّ لِلَّهِ، وَحَتَّى أَنْ يُقْذَفَ فِي النَّارِ أَحَبُّ إِلَيْهِ مِنْ أَنْ يَرْجِعَ إِلَى الْكُفْرِ، بَعْدَ إِذْ أَنْقَذَهُ اللَّهُ، وَحَتَّى يَكُونَ اللَّهُ وَرَسُولُهُ أَحَبَّ إِلَيْهِ مِمَّا سِوَاهُمَا
lā yajidu aḥadun ḥalāwaha al-īmāni ḥattā yuḥibba al-marʾa, lā yuḥibbuhu illā lillāh, waḥattā an yuqdhafa fī an-nāri aḥabbu ilayhi min an yarjiʿa ilā al-kufri, baʿda idh anqadhah Allāh, waḥattā yakūna-Llāh warasūluhu aḥabba ilayhi mimmā siwāhumā
Transliteration generated from the Arabic vowel marks
The full narration
Narrated Anas bin Malik:The Prophet (ﷺ) said, "None will have the sweetness (delight) of Faith (a) till he loves a person and loves him only for Allah's sake, (b) and till it becomes dearer to him to be thrown in the fire than to revert to disbelief (Heathenism) after Allah has brought him out of it, (c) and till Allah and His Apostle become dearer to him than anything else
Source
Ṣaḥīḥ al-Bukhārī · 6041