Musannaf Ibn Abi Shayba 37:101

Abu Usama narrated to us, from Abd al-Rahman ibn Yazid ibn Jabir, from Makhul, that Mu'adh ibn Jabal said: The flourishing of Jerusalem is the ruin of Yathrib, and the ruin of Yathrib is the occurrence of the Great War (al-Malhama), and the occurrence of the Great War is the conquest of Constantinople, and the conquest of Constantinople is the emergence of the Dajjal. Then he struck with his hand upon the shoulder of a man and said: By Allah, that is indeed the truth.