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"He it is Who drove out the disbelievers among the people of the Scripture (i.e, the Jews of the tribe of Bani An-Nadir) from their homes at the first gathering, You did not think that they would get out, And they thought that their fortresses would defend them from Allaah! But Allaah's (Torment) reached them from a place whereof they expected it not, and He cast terror into their hearts, so that they destroyed their own dwellings with their own hands and the hands of the believers, Then take admonition, O you with eyes (to see)." [Al-Hashr (59):2]

Narrated Abu Huraira:

One day while the Prophet was sitting in the company of some people, (The angel) Gabriel came and asked, "What is faith?" Allah's Apostle replied, 'Faith is to believe in Allah, His angels, (the) meeting with Him, His Apostles, and to believe in Resurrection." Then he further asked, "What is Islam?" Allah's Apostle replied, "To worship Allah Alone and none else, to offer prayers perfectly to pay the compulsory charity (Zakat) and to observe fasts during the month of Ramadan." Then he further asked, "What is Ihsan (perfection)?" Allah's Apostle replied, "To worship Allah as if you see Him, and if you cannot achieve this state of devotion then you must consider that He is looking at you." Then he further asked, "When will the Hour be established?" Allah's Apostle replied, "The answerer has no better knowledge than the questioner. But I will inform you about its portents.

1. When a slave (lady) gives birth to her master.
2. When the shepherds of black camels start boasting and competing with others in the construction of higher buildings. And the Hour is one of five things which nobody knows except Allah.

The Prophet then recited: "Verily, with Allah (Alone) is the knowledge of the Hour--." (31. 34) Then that man (Gabriel) left and the Prophet asked his companions to call him back, but they could not see him. Then the Prophet said, "That was Gabriel who came to teach the people their religion." Abu 'Abdullah said: He (the Prophet) considered all that as a part of faith. [The Book of Faith Volume 1, Book 2, Hadeeth 47]