Continuing....

He said: Then tell me about the Hour (day of judgement). He said: The one questioned about it knows no better than the questioner. He said: Then tell me about its signs. He said: That the slave-girl will give birth to her mistress and that you will see the barefooted, naked, destitute herdsmen competing in constructing lofty buildings. Then he took himself off and I stayed for a time. Then he said: O ‘Umar, do you know who the questioner was? I said: Allah and His Messenger know best. He said: It was Gabriel, who came to you to teach you your religion.

 

It was related by Muslim.