What are the connotations of "Panim be'Fanim Diber Hashem ... "?
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Rashi: Yisrael should not say that Moshe tricked them with the Aseres ha'Dibros, in the way that an agent tricks a purchaser into buying the article he is trying to sell on behalf of the seller, since they heard them directly from Hashem.
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2.
Seforno: To remind them that at Har Sinai, Hashem did not reveal Himself to them via a dream or a vision,
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but Face to face.
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In the way that He appeared to Moshe Rabeinu. See Ve'zos ha'Berachah, 34:10.
2)
Why does the Torah mention the fact that Hashem spoke to Yisrael Face to face here and not by Matan Torahi?
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Oznayim la'Torah: Because it also contains a hint of a rebuke - in that, at Har Sinai, Yisrael saw Hashem Face to faace, whereass now, after the sin of the Golden Calf, they were not even able to look at the face of Moshe.
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