Perfection of faith is is have excellence in character

that the Messenger of Allah ﷺ said: "Indeed among the believers with the most complete faith is the one who is the best in conduct, and the most kind to his family."

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنْ أَكْمَلِ الْمُؤْمِنِينَ إِيمَانًا أَحْسَنُهُمْ خُلُقًا وَأَلْطَفُهُمْ بِأَهْلِهِ وَفِي الْبَابِ عَنْ أَبِي هُرَيْرَةَ وَأَنَسِ بْنِ مَالِكٍ