וְאַתָּ֗ה פֹּה֮ עֲמֹ֣ד עִמָּדִי֒ וַאֲדַבְּרָ֣ה אֵלֶ֗יךָ אֵ֧ת כָּל־הַמִּצְוָ֛ה וְהַחֻקִּ֥ים וְהַמִּשְׁפָּטִ֖ים אֲשֶׁ֣ר תְּלַמְּדֵ֑ם וְעָשׂ֣וּ בָאָ֔רֶץ אֲשֶׁ֧ר אָנֹכִ֛י נֹתֵ֥ן לָהֶ֖ם לְרִשְׁתָּֽהּ׃
至於你，你要站在這裡，在我旁邊，我要把一切誡命、律例和典章都告訴你。你要教導他們，使他們在我賜給他們作為產業的地上遵行。」
Ibn Ezra
But you stay here with Me implying that he then re-ascend the mountain, as it is written: and I will speak to you all the commandments, the decrees, and the judgments. Thus, most of the Torah was told to Moshe on Mount Sinai. However, Moshe apparently transmitted it during the entirety of their stay in the Sinai Desert, as well as during the eleven days’ trip from Sinai.
Rashbam
'ואתה עמוד פה עמדי ואדברה אליך ...ועשו בארץ וגוthis is a reference to when Moses had said in 4,14 “G’d commanded me at that time to teach you to perform the commandments applicable in the Holy Land.”