הֵ֗ם הַֽמְדַבְּרִים֙ אֶל־פַּרְעֹ֣ה מֶֽלֶךְ־מִצְרַ֔יִם לְהוֹצִ֥יא אֶת־בְּנֵֽי־יִשְׂרָאֵ֖ל מִמִּצְרָ֑יִם ה֥וּא מֹשֶׁ֖ה וְאַהֲרֹֽן׃
These are they that spoke to Pharaoh king of Egypt, to bring out the children of Israel from Egypt. These are that Moses and Aaron.
Rashi on Exodus
הם המדברים וגו׳ THESE ARE THEY WHO SPAKE TO PHARAOH — It was they who received the command to speak to Pharaoh (cf. v. 26), and it was they who carried it out by actually speaking to him (cf. e.g. Exodus 7:7).
Rashbam on Exodus
הם המדברים, in connection with דבור, speaking, Moses is still mentioned first followed by Aaron, although in order of birth Aaron preceded Moses, being the firstborn.
Sforno on Exodus
הם המדברים, they were fit to be the spokesmen to Pharaoh and to be listened to by him with respect.