What does Genesis 42:16 mean?
Joseph has used a false accusation against his ten older half-brothers to provoke them into telling him about their family back home. Of course, as the governor of Egypt, Joseph alone knows the men are no threat, and that they're in no danger themselves. His intimidation and harshness (Genesis 42:6–14) are partly meant to maintain his secret and prepare a test. He has learned that both his father, Jacob, and only full brother, Benjamin, are both alive. Joseph decides, seemingly on the spot, that he desperately wants to see Benjamin again (Genesis 42:15).Still speaking as an Egyptian ruler, Joseph will hold all the brothers in captivity until one of them returns with the youngest brother as evidence they are truthful. If they cannot do this, Joseph will conclude they are indeed spies. In swearing by Pharaoh, Joseph's brothers would have understood him to be deadly serious.