Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Bukhari :: Book 6 :: Volume 60 :: Hadith 80
Narrated Abu Huraira:
The Verse:--"You (true Muslims) are the best of peoples ever raised up for mankind." means, the best of peoples for the people, as you bring them with chains on their necks till they embrace Islam.