Difficult Conversation #1: God and Moses
(א) וּמֹשֶׁ֗ה הָיָ֥ה רֹעֶ֛ה אֶת־צֹ֛אן יִתְר֥וֹ חֹתְנ֖וֹ כֹּהֵ֣ן מִדְיָ֑ן וַיִּנְהַ֤ג אֶת־הַצֹּאן֙ אַחַ֣ר הַמִּדְבָּ֔ר וַיָּבֹ֛א אֶל־הַ֥ר הָאֱלֹהִ֖ים חֹרֵֽבָה׃ (ב) וַ֠יֵּרָ֠א מַלְאַ֨ךְ יְהֹוָ֥ה אֵלָ֛יו בְּלַבַּת־אֵ֖שׁ מִתּ֣וֹךְ הַסְּנֶ֑ה וַיַּ֗רְא וְהִנֵּ֤ה הַסְּנֶה֙ בֹּעֵ֣ר בָּאֵ֔שׁ וְהַסְּנֶ֖ה אֵינֶ֥נּוּ אֻכָּֽל׃ (ג) וַיֹּ֣אמֶר מֹשֶׁ֔ה אָסֻֽרָה־נָּ֣א וְאֶרְאֶ֔ה אֶת־הַמַּרְאֶ֥ה הַגָּדֹ֖ל הַזֶּ֑ה מַדּ֖וּעַ לֹא־יִבְעַ֥ר הַסְּנֶֽה׃ (ד) וַיַּ֥רְא יְהֹוָ֖ה כִּ֣י סָ֣ר לִרְא֑וֹת וַיִּקְרָא֩ אֵלָ֨יו אֱלֹהִ֜ים מִתּ֣וֹךְ הַסְּנֶ֗ה וַיֹּ֛אמֶר מֹשֶׁ֥ה מֹשֶׁ֖ה וַיֹּ֥אמֶר הִנֵּֽנִי׃ (ה) וַיֹּ֖אמֶר אַל־תִּקְרַ֣ב הֲלֹ֑ם שַׁל־נְעָלֶ֙יךָ֙ מֵעַ֣ל רַגְלֶ֔יךָ כִּ֣י הַמָּק֗וֹם אֲשֶׁ֤ר אַתָּה֙ עוֹמֵ֣ד עָלָ֔יו אַדְמַת־קֹ֖דֶשׁ הֽוּא׃ (ו) וַיֹּ֗אמֶר אָנֹכִי֙ אֱלֹהֵ֣י אָבִ֔יךָ אֱלֹהֵ֧י אַבְרָהָ֛ם אֱלֹהֵ֥י יִצְחָ֖ק וֵאלֹהֵ֣י יַעֲקֹ֑ב וַיַּסְתֵּ֤ר מֹשֶׁה֙ פָּנָ֔יו כִּ֣י יָרֵ֔א מֵהַבִּ֖יט אֶל־הָאֱלֹהִֽים׃ (ז) וַיֹּ֣אמֶר יְהֹוָ֔ה רָאֹ֥ה רָאִ֛יתִי אֶת־עֳנִ֥י עַמִּ֖י אֲשֶׁ֣ר בְּמִצְרָ֑יִם וְאֶת־צַעֲקָתָ֤ם שָׁמַ֙עְתִּי֙ מִפְּנֵ֣י נֹֽגְשָׂ֔יו כִּ֥י יָדַ֖עְתִּי אֶת־מַכְאֹבָֽיו׃ (ח) וָאֵרֵ֞ד לְהַצִּיל֣וֹ ׀ מִיַּ֣ד מִצְרַ֗יִם וּֽלְהַעֲלֹתוֹ֮ מִן־הָאָ֣רֶץ הַהִוא֒ אֶל־אֶ֤רֶץ טוֹבָה֙ וּרְחָבָ֔ה אֶל־אֶ֛רֶץ זָבַ֥ת חָלָ֖ב וּדְבָ֑שׁ אֶל־מְק֤וֹם הַֽכְּנַעֲנִי֙ וְהַ֣חִתִּ֔י וְהָֽאֱמֹרִי֙ וְהַפְּרִזִּ֔י וְהַחִוִּ֖י וְהַיְבוּסִֽי׃ (ט) וְעַתָּ֕ה הִנֵּ֛ה צַעֲקַ֥ת בְּנֵי־יִשְׂרָאֵ֖ל בָּ֣אָה אֵלָ֑י וְגַם־רָאִ֙יתִי֙ אֶת־הַלַּ֔חַץ אֲשֶׁ֥ר מִצְרַ֖יִם לֹחֲצִ֥ים אֹתָֽם׃ (י) וְעַתָּ֣ה לְכָ֔ה וְאֶֽשְׁלָחֲךָ֖ אֶל־פַּרְעֹ֑ה וְהוֹצֵ֛א אֶת־עַמִּ֥י בְנֵֽי־יִשְׂרָאֵ֖ל מִמִּצְרָֽיִם׃ (יא) וַיֹּ֤אמֶר מֹשֶׁה֙ אֶל־הָ֣אֱלֹהִ֔ים מִ֣י אָנֹ֔כִי כִּ֥י אֵלֵ֖ךְ אֶל־פַּרְעֹ֑ה וְכִ֥י אוֹצִ֛יא אֶת־בְּנֵ֥י יִשְׂרָאֵ֖ל מִמִּצְרָֽיִם׃ (יב) וַיֹּ֙אמֶר֙ כִּֽי־אֶֽהְיֶ֣ה עִמָּ֔ךְ וְזֶה־לְּךָ֣ הָא֔וֹת כִּ֥י אָנֹכִ֖י שְׁלַחְתִּ֑יךָ בְּהוֹצִֽיאֲךָ֤ אֶת־הָעָם֙ מִמִּצְרַ֔יִם תַּֽעַבְדוּן֙ אֶת־הָ֣אֱלֹהִ֔ים עַ֖ל הָהָ֥ר הַזֶּֽה׃ (יג) וַיֹּ֨אמֶר מֹשֶׁ֜ה אֶל־הָֽאֱלֹהִ֗ים הִנֵּ֨ה אָנֹכִ֣י בָא֮ אֶל־בְּנֵ֣י יִשְׂרָאֵל֒ וְאָמַרְתִּ֣י לָהֶ֔ם אֱלֹהֵ֥י אֲבוֹתֵיכֶ֖ם שְׁלָחַ֣נִי אֲלֵיכֶ֑ם וְאָֽמְרוּ־לִ֣י מַה־שְּׁמ֔וֹ מָ֥ה אֹמַ֖ר אֲלֵהֶֽם׃ (יד) וַיֹּ֤אמֶר אֱלֹהִים֙ אֶל־מֹשֶׁ֔ה אֶֽהְיֶ֖ה אֲשֶׁ֣ר אֶֽהְיֶ֑ה וַיֹּ֗אמֶר כֹּ֤ה תֹאמַר֙ לִבְנֵ֣י יִשְׂרָאֵ֔ל אֶֽהְיֶ֖ה שְׁלָחַ֥נִי אֲלֵיכֶֽם׃ (טו) וַיֹּ֩אמֶר֩ ע֨וֹד אֱלֹהִ֜ים אֶל־מֹשֶׁ֗ה כֹּֽה־תֹאמַר֮ אֶל־בְּנֵ֣י יִשְׂרָאֵל֒ יְהֹוָ֞ה אֱלֹהֵ֣י אֲבֹתֵיכֶ֗ם אֱלֹהֵ֨י אַבְרָהָ֜ם אֱלֹהֵ֥י יִצְחָ֛ק וֵאלֹהֵ֥י יַעֲקֹ֖ב שְׁלָחַ֣נִי אֲלֵיכֶ֑ם זֶה־שְּׁמִ֣י לְעֹלָ֔ם וְזֶ֥ה זִכְרִ֖י לְדֹ֥ר דֹּֽר׃ (טז) לֵ֣ךְ וְאָֽסַפְתָּ֞ אֶת־זִקְנֵ֣י יִשְׂרָאֵ֗ל וְאָמַרְתָּ֤ אֲלֵהֶם֙ יְהֹוָ֞ה אֱלֹהֵ֤י אֲבֹֽתֵיכֶם֙ נִרְאָ֣ה אֵלַ֔י אֱלֹהֵ֧י אַבְרָהָ֛ם יִצְחָ֥ק וְיַעֲקֹ֖ב לֵאמֹ֑ר פָּקֹ֤ד פָּקַ֙דְתִּי֙ אֶתְכֶ֔ם וְאֶת־הֶעָשׂ֥וּי לָכֶ֖ם בְּמִצְרָֽיִם׃ (יז) וָאֹמַ֗ר אַעֲלֶ֣ה אֶתְכֶם֮ מֵעֳנִ֣י מִצְרַ֒יִם֒ אֶל־אֶ֤רֶץ הַֽכְּנַעֲנִי֙ וְהַ֣חִתִּ֔י וְהָֽאֱמֹרִי֙ וְהַפְּרִזִּ֔י וְהַחִוִּ֖י וְהַיְבוּסִ֑י אֶל־אֶ֛רֶץ זָבַ֥ת חָלָ֖ב וּדְבָֽשׁ׃ (יח) וְשָׁמְע֖וּ לְקֹלֶ֑ךָ וּבָאתָ֡ אַתָּה֩ וְזִקְנֵ֨י יִשְׂרָאֵ֜ל אֶל־מֶ֣לֶךְ מִצְרַ֗יִם וַאֲמַרְתֶּ֤ם אֵלָיו֙ יְהֹוָ֞ה אֱלֹהֵ֤י הָֽעִבְרִיִּים֙ נִקְרָ֣ה עָלֵ֔ינוּ וְעַתָּ֗ה נֵֽלְכָה־נָּ֞א דֶּ֣רֶךְ שְׁלֹ֤שֶׁת יָמִים֙ בַּמִּדְבָּ֔ר וְנִזְבְּחָ֖ה לַֽיהֹוָ֥ה אֱלֹהֵֽינוּ׃ (יט) וַאֲנִ֣י יָדַ֔עְתִּי כִּ֠י לֹֽא־יִתֵּ֥ן אֶתְכֶ֛ם מֶ֥לֶךְ מִצְרַ֖יִם לַהֲלֹ֑ךְ וְלֹ֖א בְּיָ֥ד חֲזָקָֽה׃ (כ) וְשָׁלַחְתִּ֤י אֶת־יָדִי֙ וְהִכֵּיתִ֣י אֶת־מִצְרַ֔יִם בְּכֹל֙ נִפְלְאֹתַ֔י אֲשֶׁ֥ר אֶֽעֱשֶׂ֖ה בְּקִרְבּ֑וֹ וְאַחֲרֵי־כֵ֖ן יְשַׁלַּ֥ח אֶתְכֶֽם׃ (כא) וְנָתַתִּ֛י אֶת־חֵ֥ן הָֽעָם־הַזֶּ֖ה בְּעֵינֵ֣י מִצְרָ֑יִם וְהָיָה֙ כִּ֣י תֵֽלֵכ֔וּן לֹ֥א תֵלְכ֖וּ רֵיקָֽם׃ (כב) וְשָׁאֲלָ֨ה אִשָּׁ֤ה מִשְּׁכֶנְתָּהּ֙ וּמִגָּרַ֣ת בֵּיתָ֔הּ כְּלֵי־כֶ֛סֶף וּכְלֵ֥י זָהָ֖ב וּשְׂמָלֹ֑ת וְשַׂמְתֶּ֗ם עַל־בְּנֵיכֶם֙ וְעַל־בְּנֹ֣תֵיכֶ֔ם וְנִצַּלְתֶּ֖ם אֶת־מִצְרָֽיִם׃ (א) וַיַּ֤עַן מֹשֶׁה֙ וַיֹּ֔אמֶר וְהֵן֙ לֹֽא־יַאֲמִ֣ינוּ לִ֔י וְלֹ֥א יִשְׁמְע֖וּ בְּקֹלִ֑י כִּ֣י יֹֽאמְר֔וּ לֹֽא־נִרְאָ֥ה אֵלֶ֖יךָ יְהֹוָֽה׃ (ב) וַיֹּ֧אמֶר אֵלָ֛יו יְהֹוָ֖ה (מזה) [מַה־זֶּ֣ה] בְיָדֶ֑ךָ וַיֹּ֖אמֶר מַטֶּֽה׃ (ג) וַיֹּ֙אמֶר֙ הַשְׁלִיכֵ֣הוּ אַ֔רְצָה וַיַּשְׁלִכֵ֥הוּ אַ֖רְצָה וַיְהִ֣י לְנָחָ֑שׁ וַיָּ֥נׇס מֹשֶׁ֖ה מִפָּנָֽיו׃ (ד) וַיֹּ֤אמֶר יְהֹוָה֙ אֶל־מֹשֶׁ֔ה שְׁלַח֙ יָֽדְךָ֔ וֶאֱחֹ֖ז בִּזְנָב֑וֹ וַיִּשְׁלַ֤ח יָדוֹ֙ וַיַּ֣חֲזֶק בּ֔וֹ וַיְהִ֥י לְמַטֶּ֖ה בְּכַפּֽוֹ׃ (ה) לְמַ֣עַן יַאֲמִ֔ינוּ כִּֽי־נִרְאָ֥ה אֵלֶ֛יךָ יְהֹוָ֖ה אֱלֹהֵ֣י אֲבֹתָ֑ם אֱלֹהֵ֧י אַבְרָהָ֛ם אֱלֹהֵ֥י יִצְחָ֖ק וֵאלֹהֵ֥י יַעֲקֹֽב׃ (ו) וַיֹּ֩אמֶר֩ יְהֹוָ֨ה ל֜וֹ ע֗וֹד הָֽבֵא־נָ֤א יָֽדְךָ֙ בְּחֵיקֶ֔ךָ וַיָּבֵ֥א יָד֖וֹ בְּחֵיק֑וֹ וַיּ֣וֹצִאָ֔הּ וְהִנֵּ֥ה יָד֖וֹ מְצֹרַ֥עַת כַּשָּֽׁלֶג׃ (ז) וַיֹּ֗אמֶר הָשֵׁ֤ב יָֽדְךָ֙ אֶל־חֵיקֶ֔ךָ וַיָּ֥שֶׁב יָד֖וֹ אֶל־חֵיק֑וֹ וַיּֽוֹצִאָהּ֙ מֵֽחֵיק֔וֹ וְהִנֵּה־שָׁ֖בָה כִּבְשָׂרֽוֹ׃ (ח) וְהָיָה֙ אִם־לֹ֣א יַאֲמִ֣ינוּ לָ֔ךְ וְלֹ֣א יִשְׁמְע֔וּ לְקֹ֖ל הָאֹ֣ת הָרִאשׁ֑וֹן וְהֶֽאֱמִ֔ינוּ לְקֹ֖ל הָאֹ֥ת הָאַחֲרֽוֹן׃ (ט) וְהָיָ֡ה אִם־לֹ֣א יַאֲמִ֡ינוּ גַּם֩ לִשְׁנֵ֨י הָאֹת֜וֹת הָאֵ֗לֶּה וְלֹ֤א יִשְׁמְעוּן֙ לְקֹלֶ֔ךָ וְלָקַחְתָּ֙ מִמֵּימֵ֣י הַיְאֹ֔ר וְשָׁפַכְתָּ֖ הַיַּבָּשָׁ֑ה וְהָי֤וּ הַמַּ֙יִם֙ אֲשֶׁ֣ר תִּקַּ֣ח מִן־הַיְאֹ֔ר וְהָי֥וּ לְדָ֖ם בַּיַּבָּֽשֶׁת׃ (י) וַיֹּ֨אמֶר מֹשֶׁ֣ה אֶל־יְהֹוָה֮ בִּ֣י אֲדֹנָי֒ לֹא֩ אִ֨ישׁ דְּבָרִ֜ים אָנֹ֗כִי גַּ֤ם מִתְּמוֹל֙ גַּ֣ם מִשִּׁלְשֹׁ֔ם גַּ֛ם מֵאָ֥ז דַּבֶּרְךָ֖ אֶל־עַבְדֶּ֑ךָ כִּ֧י כְבַד־פֶּ֛ה וּכְבַ֥ד לָשׁ֖וֹן אָנֹֽכִי׃ (יא) וַיֹּ֨אמֶר יְהֹוָ֜ה אֵלָ֗יו מִ֣י שָׂ֣ם פֶּה֮ לָֽאָדָם֒ א֚וֹ מִֽי־יָשׂ֣וּם אִלֵּ֔ם א֣וֹ חֵרֵ֔שׁ א֥וֹ פִקֵּ֖חַ א֣וֹ עִוֵּ֑ר הֲלֹ֥א אָנֹכִ֖י יְהֹוָֽה׃ (יב) וְעַתָּ֖ה לֵ֑ךְ וְאָנֹכִי֙ אֶֽהְיֶ֣ה עִם־פִּ֔יךָ וְהוֹרֵיתִ֖יךָ אֲשֶׁ֥ר תְּדַבֵּֽר׃ (יג) וַיֹּ֖אמֶר בִּ֣י אֲדֹנָ֑י שְֽׁלַֽח־נָ֖א בְּיַד־תִּשְׁלָֽח׃ (יד) וַיִּֽחַר־אַ֨ף יְהֹוָ֜ה בְּמֹשֶׁ֗ה וַיֹּ֙אמֶר֙ הֲלֹ֨א אַהֲרֹ֤ן אָחִ֙יךָ֙ הַלֵּוִ֔י יָדַ֕עְתִּי כִּֽי־דַבֵּ֥ר יְדַבֵּ֖ר ה֑וּא וְגַ֤ם הִנֵּה־הוּא֙ יֹצֵ֣א לִקְרָאתֶ֔ךָ וְרָאֲךָ֖ וְשָׂמַ֥ח בְּלִבּֽוֹ׃ (טו) וְדִבַּרְתָּ֣ אֵלָ֔יו וְשַׂמְתָּ֥ אֶת־הַדְּבָרִ֖ים בְּפִ֑יו וְאָנֹכִ֗י אֶֽהְיֶ֤ה עִם־פִּ֙יךָ֙ וְעִם־פִּ֔יהוּ וְהוֹרֵיתִ֣י אֶתְכֶ֔ם אֵ֖ת אֲשֶׁ֥ר תַּעֲשֽׂוּן׃ (טז) וְדִבֶּר־ה֥וּא לְךָ֖ אֶל־הָעָ֑ם וְהָ֤יָה הוּא֙ יִֽהְיֶה־לְּךָ֣ לְפֶ֔ה וְאַתָּ֖ה תִּֽהְיֶה־לּ֥וֹ לֵֽאלֹהִֽים׃ (יז) וְאֶת־הַמַּטֶּ֥ה הַזֶּ֖ה תִּקַּ֣ח בְּיָדֶ֑ךָ אֲשֶׁ֥ר תַּעֲשֶׂה־בּ֖וֹ אֶת־הָאֹתֹֽת׃ {פ}

(1) Now Moses, tending the flock of his father-in-law Jethro, the priest of Midian, drove the flock into the wilderness, and came to Horeb, the mountain of God. (2) An angel of the LORD appeared to him in a blazing fire out of a bush. He gazed, and there was a bush all aflame, yet the bush was not consumed.

(3) Moses said, “I must turn aside to look at this marvelous sight; why doesn’t the bush burn up?”

(4) When the LORD saw that he had turned aside to look, God called to him out of the bush: “Moses! Moses!” He answered, “Here I am.” (5) And He said, “Do not come closer. Remove your sandals from your feet, for the place on which you stand is holy ground. (6) I am,” He said, “the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob.” And Moses hid his face, for he was afraid to look at God. (7) And the LORD continued, “I have marked well the plight of My people in Egypt and have heeded their outcry because of their taskmasters; yes, I am mindful of their sufferings. (8) I have come down to rescue them from the Egyptians and to bring them out of that land to a good and spacious land, a land flowing with milk and honey, the region of the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites. (9) Now the cry of the Israelites has reached Me; moreover, I have seen how the Egyptians oppress them. (10) Come, therefore, I will send you to Pharaoh, and you shall free My people, the Israelites, from Egypt.”

(11) But Moses said to God, “Who am I that I should go to Pharaoh and free the Israelites from Egypt?”

(12) And He said, “I will be with you; that shall be your sign that it was I who sent you. And when you have freed the people from Egypt, you shall worship God at this mountain.”

(13) Moses said to God, “When I come to the Israelites and say to them, ‘The God of your fathers has sent me to you,’ and they ask me, ‘What is His name?’ what shall I say to them?”

(14) And God said to Moses, “Ehyeh-Asher-Ehyeh.” He continued, “Thus shall you say to the Israelites, ‘Ehyeh sent me to you.’” (15) And God said further to Moses, “Thus shall you speak to the Israelites: The LORD, the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you:
This shall be My name forever,
This My appellation for all eternity.
(16) “Go and assemble the elders of Israel and say to them: the LORD, the God of your fathers, the God of Abraham, Isaac, and Jacob, has appeared to me and said, ‘I have taken note of you and of what is being done to you in Egypt, (17) and I have declared: I will take you out of the misery of Egypt to the land of the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites, to a land flowing with milk and honey.’ (18) They will listen to you; then you shall go with the elders of Israel to the king of Egypt and you shall say to him, ‘The LORD, the God of the Hebrews, manifested Himself to us. Now therefore, let us go a distance of three days into the wilderness to sacrifice to the LORD our God.’ (19) Yet I know that the king of Egypt will let you go only because of a greater might. (20) So I will stretch out My hand and smite Egypt with various wonders which I will work upon them; after that he shall let you go. (21) And I will dispose the Egyptians favorably toward this people, so that when you go, you will not go away empty-handed. (22) Each woman shall borrow from her neighbor and the lodger in her house objects of silver and gold, and clothing, and you shall put these on your sons and daughters, thus stripping the Egyptians.”

(1) But Moses spoke up and said, “What if they do not believe me and do not listen to me, but say: The LORD did not appear to you?”

(2) The LORD said to him, “What is that in your hand?” And he replied, “A rod.” (3) He said, “Cast it on the ground.” He cast it on the ground and it became a snake; and Moses recoiled from it. (4) Then the LORD said to Moses, “Put out your hand and grasp it by the tail”—he put out his hand and seized it, and it became a rod in his hand— (5) “that they may believe that the LORD, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, did appear to you.” (6) The LORD said to him further, “Put your hand into your bosom.” He put his hand into his bosom; and when he took it out, his hand was encrusted with snowy scales! (7) And He said, “Put your hand back into your bosom.”—He put his hand back into his bosom; and when he took it out of his bosom, there it was again like the rest of his body.— (8) “And if they do not believe you or pay heed to the first sign, they will believe the second. (9) And if they are not convinced by both these signs and still do not heed you, take some water from the Nile and pour it on the dry ground, and it—the water that you take from the Nile—will turn to blood on the dry ground.”

(10) But Moses said to the LORD, “Please, O Lord, I have never been a man of words, either in times past or now that You have spoken to Your servant; I am slow of speech and slow of tongue.”

(11) And the LORD said to him, “Who gives man speech? Who makes him dumb or deaf, seeing or blind? Is it not I, the LORD? (12) Now go, and I will be with you as you speak and will instruct you what to say.”

(13) But he said, “Please, O Lord, make someone else Your agent.”

(14) The LORD became angry with Moses, and He said, “There is your brother Aaron the Levite. He, I know, speaks readily. Even now he is setting out to meet you, and he will be happy to see you. (15) You shall speak to him and put the words in his mouth—I will be with you and with him as you speak, and tell both of you what to do— (16) and he shall speak for you to the people. Thus he shall serve as your spokesman, with you playing the role of God to him. (17) And take with you this rod, with which you shall perform the signs.”

ויען משה ויאמר והן לא יאמינו לי והנכון בעיני, כי ... אמר משה והן לא יאמינו לי אחרי ראותם שלא יתן אותם פרעה להלוך ולא ישמעו עוד לקולי כלל, כי יאמרו לא נראה אליך ה', שאלו היית שליח השם לא ימרה פרעה את דברו

AND MOSES ANSWERED AND SAID: BUT, BEHOLD, THEY WILL NOT BELIEVE ME The correct interpretation appears to me to be that ... Moses said, But, behold, they will not believe me, for after seeing that Pharaoh did not give them permission to go, they would no longer believe him at all, for they will say:God has not appeared to you. If you were actually G-d’s messenger, Pharaoh would not have rebelled against His word.”

According to the Ramban, what kind of concern is Moses raising here?

וראך ושמח בלבו. לֹא כְשֶׁאַתָּה סָבוּר, שֶׁיְּהֵא מַקְפִּיד עָלֶיךָ שֶׁאַתָּה עוֹלֶה לִגְדֻלָּה; וּמִשָּׁם זָכָה אַהֲרֹן לַעֲדִי הַחֹשֶׁן הַנָּתוּן עַל הַלֵּב (שבת קל"ט):

וראך ושמח בלבו AND [AHARON] WILL BE HAPPY TO SEE YOU — it is not as you are anticipating, that he will be angry with you because you have attained a high position over him, [rather, he will be generally happy for you]. In consequence of this, Aaron was privileged to wear the ornament of the breastplate which was placed over his heart (cf. Exodus 28:29) (Shabbat 139a; Exodus Rabbah 3:17).

According to Rashi, what kind of concern is Moses raising here?

מי אנכי כי אלך וגו'. פי' אפי' בשליחות שאינה הפך רצונו כי איני חשוב לדבר לפני מלך ומאמצעות כן לא יאמן בשליחותו ויסתכן שהאדם בעל בחירה ורצון ... ועוד כי אוציא וגו' כי לזה צריך אדם גדול במעשים שיזכה לזכות גדול כזה, וחש שמא יארע תקלה לישראל באמצעות מניעת זכותו, וזה מהענוה והשפלות:

מי אנכי כי אלך, "who am I that I should be qualified to go?" Moses meant that even if he were anxious to accept such a mission he did not consider himself qualified to speak up in front of a king. Seeing that he lacked that self-confidence his mission was unlikely to succeed. ... Moses added וכי אוציא את בני ישראל, "and that I should lead the Israelites out of Egypt," in order to emphasize the enormity of the task G'd was about to place on his shoulders, i.e. to orchestrate the Exodus. He implied that in order for such an undertaking to succeed the messenger G'd chose would have to be an outstanding personality. He was afraid that if Israel would suffer some setback on the road to freedom he might be held responsible since he was not qualified to be that leader.

According to the Or HaChaim, what kind of concern is Moses raising here?

שלח נא ביד תשלח ביד מי שיהיה שליח מוכן לעשות שליחותך, ולא איש כמוני שיצטרך שתהיה עם פי ותוריני באופן שאתה תהיה המדבר:
שלח נא ביד תשלח. Use someone who is already naturally gifted for such an assignment, instead of someone like me whom You first have to train for the task, so that in effect You would do the talking.