Genesis 42:33

Then the man who is lord of the land said to us, ‘This is how I will know whether you are honest: Leave one brother with me, take food to relieve the hunger of your households, and go.

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: