Sahih Bukhari | Volume 5 | Hadith Number 644
Narrated by 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."