Genesis 42 · a question people ask
Why did Joseph treat his brothers so roughly?
Genesis gives Joseph's own stated purpose: "By this you shall be tested" and "that your words may be tested, whether there is truth in you" (42:15-16); "so will your words be verified" (42:20). It also shows what he did out of their sight: "He turned himself away from them, and wept" (42:24). The text doesn't say more about his feelings or motives.
The verses
“By this you shall be tested. By the life of Pharaoh, you shall not go out from here, unless your youngest brother comes here. Send one of you, and let him get your brother, and you shall be bound, that your words may be tested, whether there is truth in you, or else by the life of Pharaoh surely you are spies.””
“Bring your youngest brother to me; so will your words be verified, and you won’t die.” They did so.”
“He turned himself away from them, and wept. Then he returned to them, and spoke to them, and took Simeon from among them, and bound him before their eyes.”