Genesis 42:11-18
English Standard Version
12He said to them, "No, it is the nakedness of the land that you have come to see."
13And they said, "We, your servants, are twelve brothers, the sons of one man in the land of Canaan, and behold, the youngest is this day with our father, and one is no more."
14But Joseph said to them, "It is as I said to you. You are spies.
15By this you shall be tested: by the life of Pharaoh, you shall not go from this place unless your youngest brother comes here.
16Send one of you, and let him bring your brother, while you remain confined, that your words may be tested, whether there is truth in you. Or else, by the life of Pharaoh, surely you are spies."
17And he put them all together in custody for three days.