'Do You Not Know' in the Bible

Or do you not know that as many as were baptized into Christ Jesus were baptized into his death?

Do you not know that if you present yourselves as obedient slaves, you are slaves of the one you obey, either of sin resulting in death, or obedience resulting in righteousness?

Or do you not know, brothers and sisters (for I am speaking to those who know the law), that the law is lord over a person as long as he lives?

God has not rejected his people whom he foreknew! Do you not know what the scripture says about Elijah, how he pleads with God against Israel?