Genesis 42:14-18

Yet Joseph said to them, “It is as I said to you, you are spies;

by this you will be tested: by the life of Pharaoh, you shall not leave this place unless your youngest brother comes here!

Send one of you and have him get your brother, while you remain confined, so that your words may be tested, whether there is truth in you. But if not, by the life of Pharaoh, you are certainly spies!”

So he put them all together in prison for three days.

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