Sahih Muslim Book - 1, Hadith - 97

و حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَزُهَيْرُ بْنُ حَرْبٍ جَمِيعًا عَنْ ابْنِ عُلَيَّةَ قَالَ زُهَيْرٌ حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ عَنْ أَبِي حَيَّانَ عَنْ أَبِي زُرْعَةَ بْنِ عَمْرِو بْنِ جَرِيرٍ عَنْ أَبِي هُرَيْرَةَ قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمًا بَارِزًا لِلنَّاسِ فَأَتَاهُ رَجُلٌ فَقَالَ يَا رَسُولَ اللَّهِ مَا الْإِيمَانُ؟ قَالَ أَنْ تُؤْمِنَ بِاللَّهِ وَمَلَائِكَتِهِ وَكِتَابِهِ وَلِقَائِهِ وَرُسُلِهِ وَتُؤْمِنَ بِالْبَعْثِ الْآخِرِ قَالَ يَا رَسُولَ اللَّهِ مَا الْإِسْلَامُ؟ قَالَ الْإِسْلَامُ أَنْ تَعْبُدَ اللَّهَ وَلَا تُشْرِكَ بِهِ شَيْئًا وَتُقِيمَ الصَّلَاةَ الْمَكْتُوبَةَ وَتُؤَدِّيَ الزَّكَاةَ الْمَفْرُوضَةَ وَتَصُومَ رَمَضَانَ قَالَ يَا رَسُولَ اللَّهِ مَا الْإِحْسَانُ؟ قَالَ أَنْ تَعْبُدَ اللَّهَ كَأَنَّكَ تَرَاهُ فَإِنَّكَ إِنْ لَا تَرَاهُ فَإِنَّهُ يَرَاكَ قَالَ يَا رَسُولَ اللَّهِ مَتَى السَّاعَةُ؟ قَالَ مَا الْمَسْئُولُ عَنْهَا بِأَعْلَمَ مِنْ السَّائِلِ وَلَكِنْ سَأُحَدِّثُكَ عَنْ أَشْرَاطِهَا إِذَا وَلَدَتِ الْأَمَةُ رَبَّهَا فَذَاكَ مِنْ أَشْرَاطِهَا وَإِذَا كَانَتْ الْعُرَاةُ الْحُفَاةُ رُءُوسَ النَّاسِ فَذَاكَ مِنْ أَشْرَاطِهَا وَإِذَا تَطَاوَلَ رِعَاءُ الْبَهْمِ فِي الْبُنْيَانِ فَذَاكَ مِنْ أَشْرَاطِهَا فِي خَمْسٍ لَا يَعْلَمُهُنَّ إِلَّا اللَّهُ ثُمَّ تَلَا صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ { إِنَّ اللَّهَ عِنْدَهُ عِلْمُ السَّاعَةِ وَيُنَزِّلُ الْغَيْثَ وَيَعْلَمُ مَا فِي الْأَرْحَامِ وَمَا تَدْرِي نَفْسٌ مَاذَا تَكْسِبُ غَدًا وَمَا تَدْرِي نَفْسٌ بِأَيِّ أَرْضٍ تَمُوتُ إِنَّ اللَّهَ عَلِيمٌ خَبِيرٌ } قَالَ ثُمَّ أَدْبَرَ الرَّجُلُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رُدُّوا عَلَيَّ الرَّجُلَ فَأَخَذُوا لِيَرُدُّوهُ فَلَمْ يَرَوْا شَيْئًا فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ هَذَا جِبْرِيلُ جَاءَ لِيُعَلِّمَ النَّاسَ دِينَهُمْ.

It was narrated that Abu Hurairah said: "One day the Messenger of Allah (s.a.w) appeared before the people and there came to him a man who said: 'O Messenger of Allah, what is faith?' He said: 'To believe in Allah, His Angels, His Book, the meeting with Him, and His Messengers, and to believe in the Resurrection Hereafter.' He said: 'O Messenger of Allah, what is Islam?' He said: 'Islam is to worship Allah and not associate anything with Him, to establish the prescribed Salat, to pay the obligatory Zakat, and to observe fast (The month of) Ramadan.' He said: 'O Messenger of Allah, what is Al-Ihsan?' He said: 'It is to worship Allah as though you can see Him, for although you cannot see Him, He indeed sees you.' He said: 'O Messenger of Allah, when is the Hour?' He said: 'The one who is asked about it does not know more than the one who is asking. But I shall tell you of its portents: When the slave woman gives birth to her mistress, that is one of its portents. When the barefoot and naked become the leaders of the people, that is one of its portents. When the herdsmen of sheep compete in the construction of lofty buildings, that is one of its portents. The Hour is one of the five things that no one knows except Allah.' Then he recited: "Verily, Allah, with Him (Alone) is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs. No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All-Knower, All-Aware (of things)." He (Abu Hurairah) said: "Then the man went away, and the Messenger of Allah (s.a.w) said: Bring the man back to me.' They went to bring him back, but they did not see anything. The Messenger of Allah (s.a.w) said: That was Jibril, who came to teach the people their religion.'"