Sforno on Deuteronomy 33:2/ספורנו על דברים ל״ג:ב׳

1ויאמר , before he commenced with his blessing in verse 25 with the words ברזל ונחושת מנעלך, he pronounced a list of prayers addressed not to the people but to G’d, in order to prepare the ground for his blessings when he intoned it to become effective. Words of blessing are invariably addressed to the recipient of the blessing directly. When G’d instructed the priests to bless the Jewish people, part of that instruction was: אמור להם, “say to them!” (Numbers 6,23) All Moses’ words from verse 25 on are couched in this traditional mode of phrasing a blessing.

2'ה, this is an exclamation mode.

3מסיני בא וזרח וגו' אש דת למו. Moses recalls the Israelites’ merit in order that his prayer on their behalf be accepted. He therefore tells G’d, that at the time when He came from Sinai and became manifest in a number of locations to Israel, the word קדש in the expression מרבבות קודש does not refer only to the myriads of angels but to the totality of Torah, and that the experience of holiness by Israel at the time emanated from the “right” side of this emanation, i.e. the people experienced what is known in kabbalistic parlance as אספקלריאה מאירה, “a clear undistorted vision.”