Al-Adab Al-Mufrad, Book 5, Hadith 1 (In-Book) ⓘ
'A'isha said, "Abu Bakr said, 'By Allah, there is no man on the face of the earth that I love better than 'Umar.' Then he went out and came back and said, 'How did I swear, daughter?' I told him what he had said. Then he said, 'He is dearer to me although one's child is closer (to one's heart).'"
حَدَّثَنَا عَبْدُ اللهِ بْنُ صَالِحٍ قَالَ: حَدَّثَنِي اللَّيْثُ قَالَ: كَتَبَ إِلَيَّ هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: قَالَ أَبُو بَكْرٍ رَضِيَ اللَّهُ عَنْهُ يَوْمًا: وَاللَّهِ مَا عَلَى وَجْهِ الأَرْضِ رَجُلٌ أَحَبَّ إِلَيَّ مِنْ عُمَرَ، فَلَمَّا خَرَجَ رَجَعَ فَقَالَ: كَيْفَ حَلَفْتُ أَيْ بُنَيَّةُ؟ فَقُلْتُ لَهُ، فَقَالَ: أَعَزُّ عَلَيَّ، وَالْوَلَدُ أَلْوَطُ.
also referenced under: Hadith 84 (Reference) & Book 5, Hadith 84 (English)