Al-Adab Al-Mufrad #84
Looking after children
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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.
'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).'"
About Al-Adab Al-Mufrad
This hadith is #84 from Al-Adab Al-Mufrad, in the Book of Looking after children.