וַיֹּ֨אמֶר אֵלָ֤יו יְהוָה֙ לֶךְ־רֵ֔ד וְעָלִ֥יתָ אַתָּ֖ה וְאַהֲרֹ֣ן עִמָּ֑ךְ וְהַכֹּהֲנִ֣ים וְהָעָ֗ם אַל־יֶֽהֶרְס֛וּ לַעֲלֹ֥ת אֶל־יְהוָ֖ה פֶּן־יִפְרָץ־בָּֽם׃
Lalu Yang Mahakekal berfirman kepadanya: “Pergilah, turunlah, kemudian naiklah engkau bersama Harun; tetapi para imam dan umat itu janganlah menerobos untuk naik kepada Yang Mahakekal, supaya Ia tidak menerjang mereka.”
Sifra
2) "Moses called to Aaron and to his sons": Because the L–rd honored Aaron at first, so, Moses honored him afterwards. Where is it seen that the L–rd honored him at first? In (Shemoth 19:24): "And go up, you and Aaron with you" — so, Moses honored him afterwards, viz.: "Moses called to Aaron and to his sons and (only afterwards) to the elders of Israel."
Mekhilta DeRabbi Yishmael
(Ibid. 24) "And the L–rd said to him: Go descend": Well have you spoken. This is as R. Yehudah says: Whence is it derived that the Holy One Blessed be He said to Moses: I will say something to you, and you will answer Me, and I will acknowledge what you have said — so that Israel will say: Great is Moses, whom the Holy One Blessed be He acknowledged? (From the above.)
Mekhilta DeRabbi Yishmael
Rebbi says: We would have to acknowledge the greatness of Moses only if we assumed that the Holy One Blessed be He retracted His directive. (Rather,) He spoke thus because one is prompted to zeal at the time of learning (what he must do) and at the time of acting.