From the route of ^Umar who said:
“While we were sitting one day with the Messenger of Allah, sallallahu ^alayhi wa sallam, a man appeared in our session with very white clothes and very black hair. He did not have any signs of traveling on him, and no one of us knew him.
He sat down before the Prophet, sallallahu ^alayhi wa sallam, and placed his knees against the Prophet’s and placed his palms on his thighs.
He said: <<O Muhammad inform me about Islam.>>
The Messenger of Allah , sallallahu ^alayhi wa sallam said: <<Islam is to testify that no one is God except Allah and that Muhammad is the Messenger of Allah , to perform the prayers, to pay Zakat, to fast Ramadan and to offer Pilgrimage if able.>>
He said: <<You are truthful.>> We were surprised at the fact that he asked him and corroborated his truthfulness!
He said: <<Inform me about the Belief. >>
The Prophet said: <<To believe in Allah, His Angels, His Books, His Messengers, The Day of Judgment, and Destiny—what is good and what is evil.>>
He said: <<You are truthful.>>
He said: <<Inform me about Ihsan (proficiency of worship.)>> The Prophet replied: <<To worship Allah as if you see Him and if you do not, then know that He Sees you.>>
He said: <<Inform me about the time of occurrence of the Day of Judgment.>>
The Prophet said: <<The one whom you asked does not know any more about it than the one asking.>>
He said: <<Inform me about its signs.>> The Prophet replied: <<To witness the slave woman give birth to her female owner, and the bare foot, unclothed, impoverished shepherds build high rise buildings.>>
Then the man left. I stayed for a lengthy period of time then the Prophet, صل الله عليه و سلمsaid: <<O ^Umar do you know the one who was asking?>> I said: ‘Allah and His Messenger know best.’ The Prophet said: <<He was Jibril; he came to teach you the matters of your Religion.>>
Narrated by Muslim .
عَنْ عُمَرَ رَضِيَ اللهُ عَنْهُ أَيْضًا قَالَ: بَيْنَمَا نَحْنُ جُلُوسٌ عِنْدَ رَسُولِ اللَّهِ ذَاتَ يَوْمٍ، إذْ طَلَعَ عَلَيْنَا رَجُلٌ شَدِيدُ بَيَاضِ الثِّيَابِ، شَدِيدُ سَوَادِ الشَّعَرِ لاَ يُرَى عَلَيْهِ أَثَرُ السَّفَرِ وَلاَ يَعْرِفُهُ مِنَّا أَحَدٌ حَتَّى جَلَسَ إلَى النَّبِيِّ فَأَسْنَدَ رُكْبَتَيْهِ إلَى رُكْبَتَيْهِ، وَوَضَعَ كَفَّيْهِ عَلَى فَخِذَيْهِ وَقَالَ: يَا مُحَمَّدُ أَخْبِرْنِي عَنْ الإِسْلاَمِ. فَقَالَ رَسُولُ اللَّهِ: ((الإِسْلاَمُ أَنْ تَشْهَدَ أَنْ لا إلَهَ إلّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ، وَتُقِيمَ الصَّلاَةَ، وَتُؤْتِيَ الزَّكَاةَ، وَتَصُومَ رَمَضَانَ، وَتَحُجَّ الْبَيْتَ إِنِ اسْتَطَعْتَ إلَيْهِ سَبِيلاً)) قَالَ صَدَقْتَ فَعَجِبْنَا لَهُ يَسْأَلُهُ وَيُصَدِّقُهُ قَالَ فَأَخْبِرْنِي عَنْ الإِيمَانِ. قَالَ: ((أَنْ تُؤْمِنَ بِاَللَّهِ وَمَلاَئِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ وَالْيَوْمِ الآخِرِ وَتُؤْمِنَ بِالْقَدَرِ خَيْرِهِ وَشَرِّهِ)) قَالَ صَدَقْتَ. قَالَ فَأَخْبِرْنِي عَن الإِحْسَانِ. قَالَ: ((أَنْ تَعْبُدَ اللَّهَ كَأَنَّكَ تَرَاهُ فَإِنْ لَمْ تَكُنْ تَرَاهُ فَإِنَّهُ يَرَاكَ)) قَالَ فَأَخْبِرْنِي عَنْ السَّاعَةِ. قَالَ: ((مَا الْمَسْئُولُ عَنْهَا بِأَعْلَمَ مِنْ السَّائِلِ)) قَالَ فَأَخْبِرْنِي عَنْ أَمَارَاتِهَا. قَالَ: ((أَنْ تَلِدَ الأَمَةُ رَبَّتَهَا وَأَنْ تَرَى الْحُفَاةَ الْعُرَاةَ الْعَالَةَ رِعَاءَ الشَّاءِ يَتَطَاوَلُونَ فِي الْبُنْيَانِ)). ثُمَّ انْطَلَقَ فَلَبِثْتُ مَلِيًّا، ثُمَّ قَالَ: ((يَا عُمَرُ أَتَدْرِي مَن السَّائِلُ؟)) قُلْتْ: اللَّهُ وَرَسُولُهُ أَعْلَمُ. قَالَ: ((فَإِنَّهُ جِبْرِيلُ أَتَاكُمْ يُعَلِّمُكُمْ دِينَكُمْ)) رَوَاهُ مُسْلِمٌ.