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.

Wesley's Notes

42:9 He remembered the dreams, but they had forgot them. The laying up of God's oracles in our hearts will be of excellent use to us in all our conduct. Joseph had an eye to his dreams, which he knew to be divine, in his carriage towards his brethren, and aimed at the accomplishment of them, and the bringing his brethren to repentance; and both those points were gained. He shewed himself harsh with them: the very manner of his speaking, considering the post he was in, was enough to frighten them, for he spake roughly to them - He charged them with ill designs against the government, treated them as dangerous persons, ye are spies, protesting by the life of Pharaoh that they were so. Some make that an oath, others make it no more but a vehement asseveration; however, it was more than yea, yea, and nay, nay, and therefore came of evil. They hereupon were very submissive; they spoke to him with all respect; nay, my lord. They modestly deny the charge, we are no spies; they tell him their business, they came to buy food, they give a particular account of themselves and their family, Ge 42:13, and that was it he wanted. He clapt them all up in prison three days. He concluded with them at last, that one of them should be left as a hostage, and the rest should go home and fetch Benjamin. It was a very encouraging word he said, I fear God; q.d. You may assure yourselves, I will do you no wrong, I dare not, for I know that as high as I am, there is one higher than I. With those that fear God we have reason to expect fair dealing: the fear of God will be a check upon those that are in power, to restrain them from abusing their power to oppression and tyranny:

Jamieson-Fausset-Brown Bible Commentary

9-14. Ye are spies-This is a suspicion entertained regarding strangers in all Eastern countries down to the present day. Joseph, however, who was well aware that his brethren were not spies, has been charged with cruel dissimulation, with a deliberate violation of what he knew to be the truth, in imputing to them such a character. But it must be remembered that he was sustaining the part of a ruler; and, in fact, acting on the very principle sanctioned by many of the sacred writers, and our Lord Himself, who spoke parables (fictitious stories) to promote a good end.

Matthew Henry's Concise Commentary

42:7-20 Joseph was hard upon his brethren, not from a spirit of revenge, but to bring them to repentance. Not seeing his brother Benjamin, he suspected that they had made away with him, and he gave them occasion to speak of their father and brother. God, in his providence, sometimes seems harsh with those he loves, and speaks roughly to those for whom yet he has great mercy in store. Joseph settled at last, that one of them should be left, and the rest go home and fetch Benjamin. It was a very encouraging word he said to them, I fear God; as if he had said, You may be assured I will do you no wrong; I dare not, for I know there is one higher than I. With those that fear God, we may expect fair dealing.