Genesis 42:17

Joseph said to them, “It is like I told you, saying, ‘You are spies!’

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.”

Joseph said to them the third day, “Do this, and live, for I fear God.

If you are honest men, then let one of your brothers be bound in your prison; but you go, carry grain for the famine of your houses.

Bring your youngest brother to me; so will your words be verified, and you won’t die.”

They did so.