(Exodus 4:1-9) "But they will not believe me" (Exodus 4:1). Resh Lakish said: One who suspects worthy people is stricken in his body. From where do we know this? From Moses. As it is written, "But they will not believe me," yet it was revealed before the Holy One, blessed be He, that they would believe. He said to him: They are believers, children of believers, but you - in the end you will not believe. Believers, as it is written (further on, verse 31), "and the people believed." Children of believers, as it is written (Genesis 15:6), "and he believed in the LORD." And you - in the end you will not believe, as it is written, "because you did not believe in Me" (Numbers 20:12). And from where that he was stricken? As it is written, "Put now your hand into your bosom" (Exodus 4:6). Rava said: A good measure comes more swiftly than a measure of punishment. Regarding the measure of punishment it is written, "and he brought it out, and behold, his hand was leprous"; whereas regarding the good measure it is written, "and he brought it out from his bosom, and behold, it had returned like his flesh" - it was from his bosom that it returned like his flesh. "And Aaron's staff swallowed their staffs" (Exodus 7:12). Rabbi Eleazar said: A miracle within a miracle. He said to him: You speak slander against My children. Just as the serpent that spoke slander - I struck it with leprosy - so too you, "put now your hand into your bosom." "And it shall be, if they will not believe, and you shall take from the water" (Exodus 4:9) - He hinted to him: from where will you take what is yours? From the water, as it is said (Numbers 20:10), "Shall we bring forth water for you from this rock?" "And he cast it on the ground and it became a serpent" (Exodus 4:3). The Holy One, blessed be He, said to Moses: Just as the serpent twists, so Pharaoh is destined to twist against you. This is (Isaiah 46:10) "declaring the end from the beginning." The Holy One, blessed be He, said to Moses: These two signs, the serpent and the leper - one is Mine and one is yours. "And the people spoke against God and against Moses... and the LORD sent the serpents among the people" (Numbers 21:5-6) - and whoever speaks against you personally is stricken with leprosy, "and behold, Miriam was leprous as snow" (Numbers 12:10).
Moses Struck for Suspecting Israel Would Not Believe
Yalkut Shimoni on Torah 172:5
(שמות ד א-ט) וְהֵן לֹא יַאֲמִינוּ לִי, אָמַר רֵישׁ לָקִישׁ, הַחוֹשֵׁד בִּכְשֵׁרִים לוֹקֶה בְּגוּפוֹ. מִנָלָן, מִמֹּשֶׁה. דִּכְתִיב וְהֵן לֹא יַאֲמִינוּ לִי, וְקָמֵי קוּדְשָׁא בְּרִיךְ הוּא גַּלֵּיא דַּהֲווּ מְהֵימְנֵי, אָמַר לוֹ, הֵן מַאֲמִינִים בְנֵי מַאֲמִינִים, וְאַתָּה אֵין סוֹפְךָ לְהַאֲמִין. מַאֲמִינִים, דִּכְתִיב (להלן פסוק לא) "וַיַּאֲמֵן הָעָם". בְּנֵי מַאֲמִינִים, דִּכְתִיב (בראשית טו, ו) "וְהֶאֱמִין בַּה'". וְאַתָּה אֵין סוֹפְךָ לְהַאֲמִין, דִּכְתִיב "יַעַן לֹא הֶאֱמַנְתֶּם בִּי". וּמִמַּאי דְּלָקָה, דִּכְתִיב הָבֵא נָא יָדְךָ בְּחֵיקֶךָ, אָמַר רָבָא, מִדָּה טוֹבָה מְמַהֶרֶת לָבֹא מִמִּדַּת פֻּרְעָנוּת. בְּמִדַּת פֻּרְעָנוּת כְּתִיב, וַיּוֹצִאָהּ וְהִנֵּה יָדוֹ מְצֹרַעַת, וְאִלּוּ בְּמִדָּה טוֹבָה כְּתִיב, וַיּוֹצִאָהּ מֵחֵיקוֹ וְהִנֵּה שָׁבָה כִּבְשָׂרוֹ, מֵחֵיקוֹ הוּא דְּשָׁבָה כִּבְשָׂרוֹ. (שמות ז, יב) "וַיִּבְלַע מַטֵּה אַהֲרֹן אֶת מַטּוֹתָם", אָמַר רַבִּי אֶלְעָזָר, נֵס בְּתוֹךְ נֵס. אָמַר לוֹ, לָשׁוֹן הָרַע אַתָּה אוֹמֵר עַל בָּנַי, מַה הַנָּחָשׁ דְּאָמַר לָשׁוֹן הָרַע וְהִלְקִיתִי אוֹתוֹ בְּצָרַעַת, אַף אַתְּ הָבֵא נָא יָדְךָ בְּחֵיקֶךָ. וְהָיָה אִם לֹא יַאֲמִינוּ וְלָקַחְתָּ מִמֵּימֵי, רָמַז לוֹ מֵאַיִן אַתָּה תִּטוֹל שֶׁלְּךָ מִן הַמַּיִם, שֶׁנֶּאֱמַר (במדבר כ, י) "הֲמִן הַסֶּלַע הַזֶּה". וַיַּשְׁלִכֵהוּ אַרְצָה וַיְהִי לְנָחָשׁ, אָמַר הַקָּדוֹשׁ בָּרוּךְ הוּא לְמֹשֶׁה, כְּשֵׁם שֶׁהַנָּחָשׁ מִתְעַקֵּם, כָּךְ פַּרְעֹה עָתִיד לְהִתְעַקֵּם עֲלֵיכֶם. הֲוֵי (ישעיה מו, י) "מַגִּיד מֵרֵאשִׁית אַחֲרִית". אָמַר הַקָּדוֹשׁ בָּרוּךְ הוּא לְמֹשֶׁה, שְׁנֵי סִימָנִין הַלָּלוּ נָחָשׁ, וּמְצֹרָע, אֶחָד שֶׁלִּי, וְאֶחָד שֶׁלְּךָ. "וַיְדַבֵּר הָעָם בֵּאלֹהִים וּבְמֹשֶׁה וְגוֹ' וַיְשַׁלַּח ה' בָּעָם אֶת הַנְּחָשִׁים", וּמִי שֶׁהוּא מְדַבֵּר בְּעַצְמְךָ לוֹקֶה בְּצָרַעַת, (שם יב, י) "וְהִנֵּה מִרְיָם מְצֹרַעַת כַּשָּׁלֶג".