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
Hereby ye shall be proved: By the life of Pharaoh ye shall not go forth hence, except your youngest brother come hither.
Genesis 42:19
If ye be true men, let one of your brethren be bound in the house of your prison: go ye, carry corn for the famine of your houses:
Genesis 42:20
But bring your youngest brother unto me; so shall your words be verified, and ye shall not die. And they did so.