He ﷺ replied, “It is to worship Allah as though you see Him; for although you do not see Him, He surely sees you.”

“You have spoken the truth,” the man said.

Then he asked, “O Messenger of Allah, when is the Hour?”

The Prophet ﷺ answered, “The one who is questioned about it knows no more than the one who is asking.”

Thereupon he left. When he had merged into the crowd, we could no longer see him. The Prophet ﷺ then said, “That was Gabriel; he came to teach you the essentials of your religion.”