A while before the Muhammad Salalahu alayhi wasallam departed from this world, someone special came down to find out whether the Message had been fully conveyed. This would be the last Prophet out of all hundreds of thousands of them sent all over the world to different peoples, since the time of Adam peace and blessings be upon him. He would be the only one sent to the entire world. His time of death was drawing near and Omar Radhiallahu anhu narrates this hadith:
One day while we were sitting with the messenger of Allah sallalahu alayhi wasalam there appeared before us a man whose clothes were exceedingly white and whose hair was exceedingly black; no signs of journeying were to be seen on him and none of us knew him. He walked up and sat down by the prophet (peace and blessings be on him). Resting his knees against his and placing the palms of his hands on his thighs (this was a serious breach of privacy. The Prophet sallalahu alayhi wasalam was greatly loved by the Companions who were so very protective of him. To have a stranger so close to the leader of all Muslims rose the levels of tension.),
He said: “O Muhammed, tell me about Islam”.
The messenger of Allah (peace and blessings be upon him) said: “Islam is to testify that there is no god but Allah and Muhammed is the messenger of Allah, to perform the prayers, to pay the zakat, to fast in Ramadhan, and make the pilgrimage to the House if you are able to do so.”
He said: “You have spoken rightly” and we were amazed at him asking him and saying that he had spoken rightly. (no one spoke to the Prophet in that manner as if they were testing him, so this was a shock as the Companions looked on). He said “Then tell me about eman.”
He said: “It is to believe in Allah, His angels, His books, His messengers and the Last Day, and to believe in divine destiny, both the good and evil thereof.”
He said, “You have spoken rightly” He said, “Then tell me about ihsaan.”
He said: “It is to worship Allah as if you are seeing Him, and while you see Him not yet truly He sees you.”
He said: “Then tell me about the Hour.”
He said: “The one questioned about it knows no better than the questioner.”
He said: “Then tell me about its Signs.”
He said: “The slave-girl will give birth to her mistress (this has been interpreted to illustrate the disrespect children will have to their parents that the daughter becomes mistress over her mother. Another interpretation has been the use of surrogate mothers, being paid to carry another’s –usually higher class or much wealthier-child) and that you will see the barefooted, naked, destitute herdsman competing in constructing lofty buildings.”(As in Dubai the descendants of modest Bedouins are now competing to cover the skyline, also been interpreted to show the intellect of these rich competing with each other, from New York to Johannesburg to show how civilised they are from the height of their buildings.”
Then he took himself off and I stayed for a time, Then he said: “O Omar, do you know who the questioner was?
I said: “Allah and His messenger know best.”
He said: "He was Jibreel (Gabriel), who came to you to teach you your religion.”