Anas ibn Malik reported: The Prophet, peace and blessings be upon him, said, “There are three qualities in which are found the sweetness of faith: that one loves Allah and His Messenger more than anything else, that one loves a person only for the sake of Allah, and that one hates to return to unbelief just as he hates to be thrown into the Hellfire.”

Source: Sahih Bukhari 16, Sahih Muslim 43

Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim

عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ ثَلَاثٌ مَنْ كُنَّ فِيهِ وَجَدَ حَلَاوَةَ الْإِيمَانِ أَنْ يَكُونَ اللَّهُ وَرَسُولُهُ أَحَبَّ إِلَيْهِ مِمَّا سِوَاهُمَا وَأَنْ يُحِبَّ الْمَرْءَ لَا يُحِبُّهُ إِلَّا لِلَّهِ وَأَنْ يَكْرَهَ أَنْ يَعُودَ فِي الْكُفْرِ كَمَا يَكْرَهُ أَنْ يُقْذَفَ فِي النَّارِ

16 صحيح البخاري كِتَاب الْإِيمَانِ بَاب حَلَاوَةِ الْإِيمَانِ

43 صحيح مسلم كتاب الإيمان باب بيان خصال من اتصف بهن وجد حلاوة الإيمان