'Do You Not Know' in the Bible

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

Do you not know that when you present yourselves to someone as slaves for obedience, you are slaves of the one whom you obey, either of sin resulting in death, or of obedience resulting in righteousness?

Or do you not know, brethren (for I am speaking to those who know the law), that the law has jurisdiction over a person as long as he lives?

God has not rejected His people whom He foreknew. Or do you not know what the Scripture says in the passage about Elijah, how he pleads with God against Israel?