Genesis 42:29-34

29And they came unto Jacob their father unto the land of Canaan, and told him all that had befallen them; saying,

30The man, the lord of the land, spake roughly with us, and took us for spies of the country.

31And we said unto him, We are true men; we are no spies:

32we be twelve brethren, sons of our father; one is not, and the youngest is this day with our father in the land of Canaan.

33And the man, the lord of the land, said unto us, Hereby shall I know that ye are true men; leave one of your brethren with me, and take corn for the famine of your houses, and go your way:

34and bring your youngest brother unto me: then shall I know that ye are no spies, but that ye are true men: so will I deliver you your brother, and ye shall traffick in the land.