Genesis 42:14-20

But Joseph said, “It’s just as I said, you’re spies. This is how I’ll test you. As Pharaoh lives, you’re not going to leave this place until your younger brother comes here. Send one of you to get your brother while the rest of you stay here in jail. We’ll see if you’re telling the truth or not. As Pharaoh lives, I say you’re spies.” Then he threw them into jail for three days. On the third day, Joseph spoke to them. “Do this and you’ll live. I’m a God-fearing man. If you’re as honest as you say you are, one of your brothers will stay here in jail while the rest of you take the food back to your hungry families. But you have to bring your youngest brother back to me, confirming the truth of your speech—and not one of you will die.” They agreed.