Genesis 42:9

And Joseph remembered the dreams which he dreamed of them, and said unto them, Ye are spies; to see the nakedness of the land ye are come, the open, unfortified places of the country, where an attack by a hostile army would be successful. It was a particularly hard test which Joseph determined upon, but in no manner to be compared to the distress of thirteen years as slave which be had to bear on their account.