Genesis 42:18-20

New Century Version

¹⁸ On the third day Joseph said to them, “I am a God-fearing man. Do this and I will let you live: ¹⁹ If you are honest men, let one of your brothers stay here in prison while the rest of you go and carry grain back to feed your hungry families. ²⁰ Then bring your youngest brother back here to me. If you do this, I will know you are telling the truth, and you will not die.”

The brothers agreed to this.