Sahih Muslim Book 54, Hadith 42
I was standing along with Ubayy b. Ka`b and he said: The opinions of the people differ in regard to the achievement of worldly ends. I said: Yes, of course. Thereupon he said: I heard Allah's Messenger (ﷺ) as saying: The Euphrates would soon uncover a mountain of gold and when the people would bear of it they would flock towards it but the people who would possess that (treasure) (would say): If we allow these persons to take out of it they would take away the whole of it. So they would fight and ninety-nine out of one hundred would be killed. Abu Kamil in his narration said: I and Ubayy b. Ka`b stood under the shade of the battlement of Hassan.
The Euphrates would soon uncover a mountain of gold but he who is present there should not take anything from that.
Iraq would withhold its dirhams and qafiz; Syria would withhold its mudd and dinar and Egypt would withhold its irdab and dinar and you would recoil to that position from where you started and you would recoil to that position from where you started and you would recoil to that position from where you started, the flesh and blood of Abu Huraira would bear testimony to it.