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Narrated Abu Huraira (Radi-Allahu 'anhu):

One day while Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) was sitting
with the people, a man came to him walking and said, "O Allah's Apostle.
What is Belief?" The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "Belief
is to believe in Allah, His Angels, His Books, His Apostles, and the
meeting with Him, and to believe in the Resurrection." The man asked, "O
Allah's Apostle What is Islam?" The Prophet (Sallallahu 'Alaihi Wa Sallam)
replied, "Islam is to worship Allah and not worship anything besides Him,
to offer prayers perfectly, to pay the (compulsory) charity i.e. Zakat and
to fast the month of Ramadan." The man again asked, "O Allah's Apostle What
is Ihsan (i.e. perfection or Benevolence)?" The Prophet (Sallallahu 'Alaihi
Wa Sallam) said, "Ihsan is to worship Allah as if you see Him, and if you
do not achieve this state of devotion, then (take it for granted that)
Allah sees you."

The man further asked, "O Allah's Apostle When will the Hour be
established?" The Prophet (Sallallahu 'Alaihi Wa Sallam) replied, "The one
who is asked about it does not know more than the questioner does, but I
will describe to you its portents. When the lady slave gives birth to her
mistress, that will be of its portents; when the bare-footed naked people
become the chiefs of the people, that will be of its portents. The Hour is
one of five things which nobody knows except Allah. Verily, the knowledge
of the Hour is with Allah (alone). He sends down the rain, and knows that
which is in the wombs." (31.34) Then the man left. The Prophet (Sallallahu
'Alaihi Wa Sallam) said, "Call him back to me." They went to call him back
but could not see him. The Prophet (Sallallahu 'Alaihi Wa Sallam) said,
"That was Gabriel who came to teach the people their religion."