Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Muadh bin Jabal that he said: The Messenger of Allah, peace and blessings be upon him, said: The flourishing of Bayt al-Maqdis is the ruin of Yathrib, and the ruin of Yathrib is the appearance of the great battle (which will be with the Romans), and the appearance of the great battle is the conquest of Constantinople, and the conquest of Constantinople is the emergence of Dajjal. Then the Prophet, peace and blessings be upon him, struck his hand on the thigh of that man or said, on both his shoulders, and then said: This is true, just as you are here, or he said: just as you are sitting here—the reference was to Hazrat Muadh himself.