Sahih Bukhari | Volume 8 | Hadith Number 628

Narrated by 'Abdullah bin Hisham
We were with the Prophet and he was holding the hand of 'Umar bin Al-Khattab. 'Umar said to Him, "O Allah's Apostle! You are dearer to me than everything except my own self." The Prophet said, "No, by Him in Whose Hand my soul is, (you will not have complete faith) till I am dearer to you than your own self." Then 'Umar said to him, "However, now, by Allah, you are dearer to me than my own self." The Prophet said, "Now, O 'Umar, (now you are a believer)."