Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the verse «﴿كُنْتُمْ خَيْرَ أُمَّةٍ أُخْرِجَتْ لِلنَّاسِ . . . . .﴾ [آل عمران : 110]» "You are the best nation brought forth for mankind..." refers to those people who migrated to Madinah Munawwarah with the Prophet (peace be upon him).