And the man, the lord of the country, said unto us, Hereby shall I know that ye are true men; leave one of your brethren here with me, and take food for the famine of your households, and be gone:
Genesis 42:15
By this you shall be tested: by the life of Pharaoh, you shall not go from this place unless your youngest brother comes here.
Genesis 42:19
if you are honest men, let one of your brothers remain confined in your prison, and let the rest go and carry grain for the famine of your households,
Genesis 42:20
and bring your youngest brother to me; so your words will be verified, and you shall not die." And they did so.