(16) باب الدَّلِيلِ عَلَى زِيَادَةِ الإِيمَانِ وَنُقْصَانِهِ
Narrated AbuHurayrah:
The Prophet (ﷺ) said: The most perfect believer in respect of faith is he who is best of them in manners.
Reference: Sunan Abi Dawud 4682
In-book reference: Book 42, Hadith 87
English translation: Book 41, Hadith 4665