'Do You Not Know' in the Bible

Or, do you not know that all of us who have been baptized into union with Christ Jesus have been baptized into His death?

Do you not know that when you habitually offer yourselves to anyone for obedience to him, you are slaves to that one whom you are in the habit of obeying, whether it is the slavery to sin whose end is death or to obedience whose end is right-doing?

Do you not know, brothers -- for I speak to those who are acquainted with the law -- that the law can press its claim over a man only so long as he lives?