The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 6140
Abu Huraira reported that Allah's Messenger (may peace be upon him) gave a proposal of marriage to Umm Hani, the daughter of Abu Talib, whereupon she said: Allah's Messenger, I am of an advanced age with a (large) family. Thereupon Allah's Messenger (may peace be upon him) said: The best women are those who ride (the camels) ; the rest of the hadith is the same but with this difference that, instead of the word Ar'a the word Ahna has been used (and the complete sentence is like this): That they treat children in their childhood with affection.