Concerning the verse, "You are the best nation brought forth for mankind" [Surah Al Imran: 110], Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "It refers to those who emigrated with the Messenger of Allah (peace and blessings be upon him) to Madinah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12251