Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 644
Narrated Abu Uthman:
Allah's Apostle sent 'Amr bin Al As as the commander of the troops of Dhat-us-Salasil. 'Amr bin Al-'As said, "(On my return) I came to the Prophet and said, 'Which people do you love most?' He replied, 'Aisha.' I said, 'From amongst the men?' He replied, 'Her father (Abu Bakr)'. I said, 'Whom (do you love) next?' He replied, "Umar.' Then he counted the names of many men, and I became silent for fear that he might regard me as the last of them."