سنن ابن ماجه

It was narrated that Jubair bin Nufair said: “Jubair said to me: ‘Let’s go to Dhu Mikhmar, who was a man from among the Companions of the Prophet (ﷺ).’ So I went with them and he asked him about the peace treaty (with the Romans). He said: ‘I heard the Prophet (ﷺ) say: “The Romans will enter into a peace treaty with you, then you and they will fight one another as enemies, and you will be victorious; you will collect the spoils of war and be safe. Then you will come back until you stop in a meadow with many hillocks. A man from among the people of the Cross will raise the Cross and will say: ‘The Cross has prevailed.’ Then a man among the Muslims will become angry and will go and break the Cross. Then the Romans will prove treacherous (breaking the treaty) (and will gather) for the fierce battle.”