Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 677
Narrated 'Adi bin Hatim:
We came to 'Umar in a delegation (during his rule). He started calling the men one by one, calling each by his name. (As he did not call me early) I said to him. "Don't you know me, O chief of the Believers?" He said, "Yes, you embraced Islam when they (i.e. your people) disbelieved; you have come (to the Truth) when they ran away; you fulfilled your promises when they broke theirs; and you recognized it (i.e. the Truth of Islam) when they denied it." On that, 'Adi said, "I therefore don't care."