Hadith 31-109

وَبِهذَا الإِسنادِ قالَ: قالَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: أَحْسَنُ النَّاسِ إِيماناً أَحْسَنُهُم خُلُقاً أَلطَفُهُم بِأهلِه، وَأَنَا ألطَفُكُم بِأَهلِي.

According to the same documentation, God’s Prophet (S) said, “The people with the best faith are those who are good-tempered and treat their families with kindness. I am the best of you in treating my family with kindness.”