Musannaf Ibn Abi Shayba 37:415

Abdullah ibn Numayr narrated to us, he said: Isma'il ibn Abi Khalid narrated to us, from his father, from Abu Hurayrah, who said: The Hour will not be established until the city of Heraclius, Caesar, is conquered, and the caller (or callers) calls out in it, and wealth is divided in it by shields. They will come with the most wealth people have ever seen. Then the crier will come to them saying that the Dajjal has replaced you among your families. So they will cast away what is in their hands and come to fight him.