Joseph remembered his dreams about them and said, “You are spies! You have come to see if our land is vulnerable.”
9. And Joseph remembered the dreams. When the boy Joseph had spoken of receiving obeisance, the absurdity of the thing impelled his brethren wickedly to devise his death. Now, although they bow down to him without knowing him, there is yet nothing better for them. Indeed, their only means of safety, is to prostrate themselves at his feet, and to be received by him as suppliants.
We may well wonder that Joseph, during the twenty years that he had now been in Egypt, especially during the last seven years that he had been in power there, never sent to his father to acquaint him with his circumstances; nay, it is strange that he who so often went throughout all the land of Egypt (Gen 41:45, Gen 41:46) never made an excursion...
Commenting on Genesis 42:7-20
We are all one man's sons,.... Therefore not likely to be spies; it could hardly be thought that a single family should engage in such an affair; or that one man would, send his sons as spies, and especially all of them, it being a dangerous affair, and they being liable to be taken up and put to death; and as more families than one...