Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 73

وَعَن أسلم قَالَ: سَأَلَنِي ابْنُ عُمَرَ بَعْضَ شَأْنِهِ – يَعْنِي عُمَرَ – فَأَخْبَرْتُهُ فَقَالَ: مَا رَأَيْتُ أَحَدًا قَطُّ بَعْدَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مِنْ حِينِ قُبِضَ كَانَ أَجَدَّ وَأَجْوَدَ حَتَّى انْتهى من عمر. رَوَاهُ البُخَارِيّ

Aslam said: Ibn `Umar asked me something about him, i.e., ‘Umar, and when I informed him, he said, “I never saw anyone after the time when God’s messenger was taken who was more earnest or excellent up to the end of his life than `Umar.” Bukhari transmitted it.