The Book Pertaining to the Turmoil and Portents of the Last Hour (Kitab Al-Fitan wa Ashrat As-Sa`ah)
Muslim :: Book 41 : Hadith 6979
Abu Huraira reported Allah's Apostle (may peace he upon him) saying: You have heard about a city the one side of which is in the land and the other is in the sea (Constantinople). They said: Allall's Messenger, yes. Thererupon he said: The Last Hour would not cmoe unlesss seventy thousand persons from Bani lsra'il would attack it. When they would land there, they will neither fight with weapons nor would shower arrows but would only say:" There is no god but Allah and Allah is the Greatest," that one side of it would fall. Thaur (one of the narrators) said: I think that he said: The part by the side of the ocean. Then they would say for the second time:" There is no god but Allah and Allah is the Greatest" that the second side would also fall, and they would say:" There is no god but Allah and Allah is the Greatest," that the gates would be opened for them and they would enter therein and, they would be collecting spoils of war and distributing them amongst themselves that a noise would be heard and It would be said: Verily, Dajjal has come. And thus they would leave everything there and would turn to him.