'Do You Not Know' in the Bible

Then Abner called to Joab, “Must the sword devour forever? Do you not know that it will be bitter in the end? How long [will it be] before you tell the people to stop pursuing their brothers?”

Then the king said to his servants, “Do you not know that a prince and a great man has fallen this day in Israel?

Do you not know what I and my fathers (ancestors) have done to all the peoples of the [other] lands? Were the gods of the nations of those lands able to rescue their lands from my hand at all?

“Do you not know this from the old days,Since the time that man was placed on the earth,

Do you [who worship idols] not know? Have you not heard?Has it not been told to you from the beginning?Have you not understood from the foundations of the earth [the omnipotence of God and the stupidity of bowing to idols]?

“Say now to the rebellious house, ‘Do you not know (realize) what these things mean?’ Tell them, ‘Hear this, the king of Babylon came to Jerusalem and took its king [Jehoiachin] and its princes and brought them with him to Babylon.

Then the angel who was speaking with me answered me, “Do you not know what these are?” And I said, “No, my lord.”

And he answered me, “Do you not know what these are?” And I said, “No, my lord.”