Sahih Muslim Book 41, Hadith Number 6908.
Hudhaifa b. al-Yaman reported: By Allah, I have the best knowledge amongst people about every turmoil which is going to appear in the period intervening me and the Last Hour; and it is not for the fact that Allah’s Messenger (may peace be upon him) told me something confidentially pertaining to it and he did not tell anybody else about it, but it is because of the fact that I was present in the assembly in which he had been describing the turmoil. and he especially made a mention of three turmoil’s which would not spare anything and amongst these there would be turmoil’s like storms in the hot season. Some of them would be violent and some of them would be comparatively mild. Hudhaifa said: All (who were present) except I have gone (to the next world).