Saleem bin Aamir says that once Hazrat Ameer Muawiya (may Allah be pleased with him) set out with an army towards the land of Rome. The agreed period of the treaty between Hazrat Muawiya (may Allah be pleased with him) and the Romans was still remaining. Hazrat Muawiya (may Allah be pleased with him) thought that he would stop after reaching near them, and as soon as the period ended, he would start fighting them. But what he saw was that an old man riding a mount was going along saying, "Fulfill the promise, do not break the covenant." The Prophet (peace and blessings be upon him) said: "If a person has a treaty with any nation, he should not untie or tie its knot before the period ends or before they break the covenant from their side." When Hazrat Muawiya (may Allah be pleased with him) came to know of this, he turned back, and it was found out that the old man was Hazrat Amr bin Abasah (may Allah be pleased with him).