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."
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " 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 ".
Bukhari
Good Manners and Form (Al-Adab) • Hadith 71