I heard the Messenger of Allah ﷺ say: you will make a secure peace with the Byzantines, then you and they will fight an enemy behind you, and you will be victorious, take booty, and be safe. You will then return and alight in a meadow with mounds and one of the Christians will raise the cross and say: The cross has conquered. One of the Muslims will become angry and smash it, and the Byzantines will act treacherously and prepare for the battle.  

جُبَيْرٌ انْطَلِقْ بِنَا إِلَى ذِي مِخْبَرٍ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ فَأَتَيْنَاهُ فَسَأَلَهُ جُبَيْرٌ عَنِ الْهُدْنَةِ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ سَتُصَالِحُونَ الرُّومَ صُلْحًا آمِنًا فَتَغْزُونَ أَنْتُمْ وَهُمْ عَدُوًّا مِنْ وَرَائِكُمْ فَتُنْصَرُونَ وَتَغْنَمُونَ وَتَسْلَمُونَ ثُمَّ تَرْجِعُونَ حَتَّى تَنْزِلُوا بِمَرْجٍ ذِي تُلُولٍ فَيَرْفَعُ رَجُلٌ مِنْ أَهْلِ النَّصْرَانِيَّةِ الصَّلِيبَ فَيَقُولُ غَلَبَ الصَّلِيبُ فَيَغْضَبُ رَجُلٌ مِنَ الْمُسْلِمِينَ فَيَدُقُّهُ فَعِنْدَ ذَلِكَ تَغْدِرُ الرُّومُ وَتَجْمَعُ لِلْمَلْحَمَةِ  

The Muslims will then make for their weapons and will fight, and Allah will honor that body with martryrdom. Abu Dawud said: But al-Walid has narrated this tradition from Dhu Mikhbar from the Prophet ﷺ. Abu Dawud said: Rawh, Yahya bin Hamzah and Bishr bin Bakr has also transmitted it from al-Awza'i as mentioned by 'Isa.  

عَنِ النَّبِيِّ ﷺ