Commento su Genesi 42:14

הוא אשר דברתי THAT IS IT THAT I SPAKE UNTO YOU — The statement which I made — that you are spies — is true and certain. This is the meaning according to the literal sense of the words. A Midrashic explanation is: he said to them, “And if you find him (your brother) and they demand of YOU a large sum, would you redeem him?” They answered him, “Certainly!” He asked them, “If they tell you that they will not restore him to you for any sum of money, what would you do?” They replied, “That is what we have come for — to kill or to be killed”. Whereupon he retorted:הוא אשר דברתי אליכם THAT IS JUST WHAT I SAID TO YOU — you have come to kill the people of this city. I have divined by my goblet that two of you destroyed the great city of Shechem (Genesis Rabbah 91:7).

הוא אשר דברתי אליכם, the very one of whom you have said that he is no longer, whereas you refused to be specific about what happened to him, is the one who went back to report all that you have seen here, or that you have decided to stay a while in order to engage in spying.

הוא אשר דברתי, "This is precisely what I have said (you came to spy)." Joseph meant: "I do not retract a single word from what I have said before." The word לאמור here means "I continue to say what I have said all along."