Narrated Abu Wail from Hudhaifa R.a:
`Umar asked the people, “Who remembers the narration of the Prophet ‘s. A.w about the affliction?” Hudhaifa said, “I heard the Prophet ‘s. a.w saying, ‘The affliction of a person in his property, family and neighbors is expiated by his prayers, fasting, and giving in charity.

” `Umar said, “I do not ask about that, but I ask about those afflictions which will spread like the waves of the sea.”

Hudhaifa replied, “There is a closed gate in front of those afflictions.

” `Umar asked, “Will that gate be opened or broken?” He replied, “It will be broken.”

`Umar said, “Then the gate will not be closed again till the Day of Resurrection.”

We said to Masruq, “Would you ask Hudhaifa whether `Umar knew what that gate symbolized?” He asked him and he replied “He `Umar knew it as one knows that there will be night before tomorrow, morning.