Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abu Hurairah that he said: The Day of Judgment will not be established until the city of Heraclius Caesar is conquered, and the muezzins will call the adhan in it, and wealth will be distributed there by means of shields. Then they will return with a great amount of wealth which people will see. Then a caller will come to them saying: The Dajjal is behind you, present in your homes. So whatever wealth is in their possession, they will throw it away and turn their attention to fighting him.