Ibn Umar reported: I was with the Messenger of Allah, peace and blessings be upon him, when a man from the Ansar came and he greeted him with peace. Then he said, “O Messenger of Allah, which of the believers is best?” The Prophet said, “Those with the best character.” He said, “Which of the believers is the most wise?” The Prophet said, “Those who remember death often and have best prepared for it with good deeds. Those are the wisest.”

Source: Sunan Ibn Majah 4259

Grade: Hasan (fair) according to Al-Albani

عَنْ ابْنِ عُمَرَ أَنَّهُ قَالَ كُنْتُ مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَجَاءَهُ رَجُلٌ مِنْ الْأَنْصَارِ فَسَلَّمَ عَلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ثُمَّ قَالَ يَا رَسُولَ اللَّهِ أَيُّ الْمُؤْمِنِينَ أَفْضَلُ قَالَ أَحْسَنُهُمْ خُلُقًا قَالَ فَأَيُّ الْمُؤْمِنِينَ أَكْيَسُ قَالَ أَكْثَرُهُمْ لِلْمَوْتِ ذِكْرًا وَأَحْسَنُهُمْ لِمَا بَعْدَهُ اسْتِعْدَادًا أُولَئِكَ الْأَكْيَاسُ

4259 سنن ابن ماجه كتاب الزهد باب ذكر الموت والاستعداد له

المحدث الألباني خلاصة حكم المحدث حسن

http://dailyhadith.abuaminaelias.com/2012/09/13/hadith-on-wisdom-the-best-believers-have-the-best-character-and-prepare-for-death-by-doing-good-works/