Genesis 42:33 in the King James Version
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:
Context
32 We are twelve brothers, sons of our father; one is no more, and the youngest is today with our father in the land of Canaan.’
33 The man, the lord of the land, said to us, ‘By this I will know that you are honest men: leave one of your brothers with me, and take grain for the famine of your houses, and go your way.
34 Bring your youngest brother to me. Then I will know that you are not spies, but that you are honest men. So I will deliver your brother to you, and you shall trade in the land.’”