“The Hour will begin when the Romans are the greatest people in number.” `Amr said, “Watch what you say!” He said, “I am saying what I heard from the Messenger of Allah صلى الله عليه وسلم.” He said, “If you say that, it is a fact, for they have four qualities. They are the most patient of people at times of tribulation; they recover quickly from calamity; they are quick to recover and attack again after defeat; and they are good to the poor, orphans and the weak. And a fifth good quality that they have is that they resist the oppression of kings.”

Al-Mustawrid Al-Qurashi said to `Amr Ibn Al-`Aas: I heard the Messenger of Allah صلى الله عليه وسلم saying, “The Hour will begin when the Romans are the greatest people in number.” `Amr said, “Watch what you say!” He said, “I am saying what I heard from the Messenger of Allah صلى الله عليه وسلم.” He said, “If you say that, it is a fact, for they have four qualities. They are the most patient of people at times of tribulation; they recover quickly from calamity; they are quick to recover and attack again after defeat; and they are good to the poor, orphans and the weak. And a fifth good quality that they have is that they resist the oppression of kings.”

Sahih Muslim, 2889