Genesis 42:9-12, 14-17, 19, 20

Then he remembered his dreams about them and said to them, “You are spies! You have come to see where our land is unprotected.” “No, my lord,” they answered. “Your servants have come to buy food. We are all the sons of one man. Your servants are honest men, not spies.” “No!” he said to them. “You have come to see where our land is unprotected.”

Joseph said to them, “It is just as I told you: You are spies! And this is how you will be tested: As surely as Pharaoh lives, you will not leave this place unless your youngest brother comes here. Send one of your number to get your brother; the rest of you will be kept in prison, so that your words may be tested to see if you are telling the truth. If you are not, then as surely as Pharaoh lives, you are spies!” And he put them all in custody for three days.

If you are honest men, let one of your brothers stay here in prison, while the rest of you go and take grain back for your starving households.

But you must bring your youngest brother to me, so that your words may be verified and that you may not die.” This they proceeded to do.