It is narrated from Hazrat Mustawrid (may Allah be pleased with him) that once I was with Hazrat Amr bin Al-Aas (may Allah be pleased with him). During the conversation, I said to him that I heard the Prophet (peace and blessings be upon him) say: "The most severe people against you will be the Romans, and their destruction will only be completed near the Day of Judgment." Hazrat Amr (may Allah be pleased with him) said, "Did I not forbid you from saying such things?"