וְאַתָּ֗ה פֹּה֮ עֲמֹ֣ד עִמָּדִי֒ וַאֲדַבְּרָ֣ה אֵלֶ֗יךָ אֵ֧ת כָּל־הַמִּצְוָ֛ה וְהַחֻקִּ֥ים וְהַמִּשְׁפָּטִ֖ים אֲשֶׁ֣ר תְּלַמְּדֵ֑ם וְעָשׂ֣וּ בָאָ֔רֶץ אֲשֶׁ֧ר אָנֹכִ֛י נֹתֵ֥ן לָהֶ֖ם לְרִשְׁתָּֽהּ׃
toi ensuite, tu resteras ici avec moi, et je te dirai toute la loi, et les statuts et les règles que tu dois leur enseigner, afin qu’ils les observent dans le pays dont je leur destine la possession."
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.
Ramban
THAT THEY MAY DO THEM IN THE LAND. I have explained it.199Above, 4:5.
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.”