"One day while we were sitting with Allaah's Messenger a man suddenly appeared before us, wearing a very white dress and having very black hair, without any signs of journey upon him, and none of us knew him. He approached until he sat before the Prophet with his knees touching the Prophet's knees and he placed his hands on his thighs and said "O Muhammad inform me about Islaam." Allaah's Messenger said, "Islaam is to bear witness that none has the right to be worshipped but Allaah, and that Muhammad is the Messenger of Allaah, to offer the Salaat (five daily prayers), pay Zakaat (annual charity), fast during the month of Ramadhan (fasting from sunrise to sunset), and to make Hajj (pilgrimage to Makkah) if you are able and have the means to make the journey." The man then said, "You have spoken the truth." We were surprised at his asking and confirming at the same time. He said "Inform me about Ihsaan" The Prophet said "Ihsaan (perfection) is to worship Allaah as if you see him; if you can't see Him, surely he sees you." He said, "Inform me about the Hour (doomsday, just before the day of judgment)." He (the Messenger of Allaah) said, "The one asked has no more knowledge of it than the questioner." He said, "(Its signs are) the slave-girl will give birth to her mistress [i.e. the children will dominate their parents] and you will see the barefooted, naked, impoverished sheepherders competing with each other in building tall buildings [i.e. people who where very poor a few years ago will suddenly become so rich that they will start competing with each other in building skyscrapers]." Then the stranger left. The Prophet remained seated for quite a while, then he asked me, "O Umar, do you know who the questioner was?" I said, "Allaah and His Messenger know best." He said , "That was Jibreel (Gabriel), he came to teach you your religion."