Exodus 19 Commentary From A Bar Mitzvah Student
(י) וַיֹּ֨אמֶר יְהוָ֤ה אֶל־מֹשֶׁה֙ לֵ֣ךְ אֶל־הָעָ֔ם וְקִדַּשְׁתָּ֥ם הַיּ֖וֹם וּמָחָ֑ר וְכִבְּס֖וּ שִׂמְלֹתָֽם׃
(10) and the LORD said to Moses, “Go to the people and warn them to stay pure today and tomorrow. Let them wash their clothes.

The holiday of Shavuot commemorates when the Israelites received the laws of the Torah on Sinai. Exodus 19:10, immediately before the Ten Commandments are revealed, has God say to Moses that they must be pure in order for them to be kept.

(יא) וְהָי֥וּ נְכֹנִ֖ים לַיּ֣וֹם הַשְּׁלִישִׁ֑י כִּ֣י ׀ בַּיּ֣וֹם הַשְּׁלִישִׁ֗י יֵרֵ֧ד יְהוָ֛ה לְעֵינֵ֥י כָל־הָעָ֖ם עַל־הַ֥ר סִינָֽי׃ (יב) וְהִגְבַּלְתָּ֤ אֶת־הָעָם֙ סָבִ֣יב לֵאמֹ֔ר הִשָּׁמְר֥וּ לָכֶ֛ם עֲל֥וֹת בָּהָ֖ר וּנְגֹ֣עַ בְּקָצֵ֑הוּ כָּל־הַנֹּגֵ֥עַ בָּהָ֖ר מ֥וֹת יוּמָֽת׃ (יג) לֹא־תִגַּ֨ע בּ֜וֹ יָ֗ד כִּֽי־סָק֤וֹל יִסָּקֵל֙ אוֹ־יָרֹ֣ה יִיָּרֶ֔ה אִם־בְּהֵמָ֥ה אִם־אִ֖ישׁ לֹ֣א יִחְיֶ֑ה בִּמְשֹׁךְ֙ הַיֹּבֵ֔ל הֵ֖מָּה יַעֲל֥וּ בָהָֽר׃ (יד) וַיֵּ֧רֶד מֹשֶׁ֛ה מִן־הָהָ֖ר אֶל־הָעָ֑ם וַיְקַדֵּשׁ֙ אֶת־הָעָ֔ם וַֽיְכַבְּס֖וּ שִׂמְלֹתָֽם׃
(11) Let them be ready for the third day; for on the third day the LORD will come down, in the sight of all the people, on Mount Sinai. (12) You shall set bounds for the people round about, saying, ‘Beware of going up the mountain or touching the border of it. Whoever touches the mountain shall be put to death: (13) no hand shall touch him, but he shall be either stoned or shot; beast or man, he shall not live.’ When the ram’s horn sounds a long blast, they may go up on the mountain.” (14) Moses came down from the mountain to the people and warned the people to stay pure, and they washed their clothes.

After this same quote, God gives reason and judgement as to why we must obey him. God wants all the people to be clean and pure in order for them to come into their own; in order for you to take something to heart, you have to be rid of all doubts of truth or not. God doesn't want them to touch the mountain because he knows you have to work and give space in order for benefits to come to you. As the adage says, "Good things come to those who wait". The Israelites understand this and thus wash their clothes so they can be pure and accepting of his command when he is ready.

(יח) וְהַ֤ר סִינַי֙ עָשַׁ֣ן כֻּלּ֔וֹ מִ֠פְּנֵי אֲשֶׁ֨ר יָרַ֥ד עָלָ֛יו יְהוָ֖ה בָּאֵ֑שׁ וַיַּ֤עַל עֲשָׁנוֹ֙ כְּעֶ֣שֶׁן הַכִּבְשָׁ֔ן וַיֶּחֱרַ֥ד כָּל־הָהָ֖ר מְאֹֽד׃
(18) Now Mount Sinai was all in smoke, for the LORD had come down upon it in fire; the smoke rose like the smoke of a kiln, and the whole mountain trembled violently.
(כג) וַיֹּ֤אמֶר מֹשֶׁה֙ אֶל־יְהוָ֔ה לֹא־יוּכַ֣ל הָעָ֔ם לַעֲלֹ֖ת אֶל־הַ֣ר סִינָ֑י כִּֽי־אַתָּ֞ה הַעֵדֹ֤תָה בָּ֙נוּ֙ לֵאמֹ֔ר הַגְבֵּ֥ל אֶת־הָהָ֖ר וְקִדַּשְׁתּֽוֹ׃
(23) But Moses said to the LORD, “The people cannot come up to Mount Sinai, for You warned us saying, ‘Set bounds about the mountain and sanctify it.’”

God is ready for one of the biggest moments in Exodus, the giving of the Ten Commandments in Exodus 19:18. The significance of Moses' words is profound in Exodus 19:23, people respecting God. The primeval history is all about disrespect of God, from the Fall of Man to Noah's Ark. It is only after Abraham founds the Jewish people that respect for God first happens (the Binding of Issac). Moses culminates Abraham's foundation by respecting the words of God, which is touched upon greatly in Leviticus.

(כד) וַיֹּ֨אמֶר אֵלָ֤יו יְהוָה֙ לֶךְ־רֵ֔ד וְעָלִ֥יתָ אַתָּ֖ה וְאַהֲרֹ֣ן עִמָּ֑ךְ וְהַכֹּהֲנִ֣ים וְהָעָ֗ם אַל־יֶֽהֶרְס֛וּ לַעֲלֹ֥ת אֶל־יְהוָ֖ה פֶּן־יִפְרָץ־בָּֽם׃
(24) So the LORD said to him, “Go down, and come back together with Aaron; but let not the priests or the people break through to come up to the LORD, lest He break out against them.”
(כה) וַיֵּ֥רֶד מֹשֶׁ֖ה אֶל־הָעָ֑ם וַיֹּ֖אמֶר אֲלֵהֶֽם׃ (ס)
(25) And Moses went down to the people and spoke to them.

The final two verses of this chapter affirm that certain people (those who have always been loyal to Adonai) are detailed to certain privileges that other wishy-washy people aren't. God thinks that if the Israelites see him, he will be treated like an idol (see 10 Commandments and Ki Tisa) and that's why only Moses and Aaron are allowed to see him in the giving of the Ten Commandments.

(א) בַּחֹ֙דֶשׁ֙ הַשְּׁלִישִׁ֔י לְצֵ֥את בְּנֵי־יִשְׂרָאֵ֖ל מֵאֶ֣רֶץ מִצְרָ֑יִם בַּיּ֣וֹם הַזֶּ֔ה בָּ֖אוּ מִדְבַּ֥ר סִינָֽי׃ (ב) וַיִּסְע֣וּ מֵרְפִידִ֗ים וַיָּבֹ֙אוּ֙ מִדְבַּ֣ר סִינַ֔י וַֽיַּחֲנ֖וּ בַּמִּדְבָּ֑ר וַיִּֽחַן־שָׁ֥ם יִשְׂרָאֵ֖ל נֶ֥גֶד הָהָֽר׃ (ג) וּמֹשֶׁ֥ה עָלָ֖ה אֶל־הָאֱלֹהִ֑ים וַיִּקְרָ֨א אֵלָ֤יו יְהוָה֙ מִן־הָהָ֣ר לֵאמֹ֔ר כֹּ֤ה תֹאמַר֙ לְבֵ֣ית יַעֲקֹ֔ב וְתַגֵּ֖יד לִבְנֵ֥י יִשְׂרָאֵֽל׃ (ד) אַתֶּ֣ם רְאִיתֶ֔ם אֲשֶׁ֥ר עָשִׂ֖יתִי לְמִצְרָ֑יִם וָאֶשָּׂ֤א אֶתְכֶם֙ עַל־כַּנְפֵ֣י נְשָׁרִ֔ים וָאָבִ֥א אֶתְכֶ֖ם אֵלָֽי׃ (ה) וְעַתָּ֗ה אִם־שָׁמ֤וֹעַ תִּשְׁמְעוּ֙ בְּקֹלִ֔י וּשְׁמַרְתֶּ֖ם אֶת־בְּרִיתִ֑י וִהְיִ֨יתֶם לִ֤י סְגֻלָּה֙ מִכָּל־הָ֣עַמִּ֔ים כִּי־לִ֖י כָּל־הָאָֽרֶץ׃ (ו) וְאַתֶּ֧ם תִּהְיוּ־לִ֛י מַמְלֶ֥כֶת כֹּהֲנִ֖ים וְג֣וֹי קָד֑וֹשׁ אֵ֚לֶּה הַדְּבָרִ֔ים אֲשֶׁ֥ר תְּדַבֵּ֖ר אֶל־בְּנֵ֥י יִשְׂרָאֵֽל׃ (ז) וַיָּבֹ֣א מֹשֶׁ֔ה וַיִּקְרָ֖א לְזִקְנֵ֣י הָעָ֑ם וַיָּ֣שֶׂם לִפְנֵיהֶ֗ם אֵ֚ת כָּל־הַדְּבָרִ֣ים הָאֵ֔לֶּה אֲשֶׁ֥ר צִוָּ֖הוּ יְהוָֽה׃ (ח) וַיַּעֲנ֨וּ כָל־הָעָ֤ם יַחְדָּו֙ וַיֹּ֣אמְר֔וּ כֹּ֛ל אֲשֶׁר־דִּבֶּ֥ר יְהוָ֖ה נַעֲשֶׂ֑ה וַיָּ֧שֶׁב מֹשֶׁ֛ה אֶת־דִּבְרֵ֥י הָעָ֖ם אֶל־יְהוָֽה׃ (ט) וַיֹּ֨אמֶר יְהוָ֜ה אֶל־מֹשֶׁ֗ה הִנֵּ֨ה אָנֹכִ֜י בָּ֣א אֵלֶיךָ֮ בְּעַ֣ב הֶֽעָנָן֒ בַּעֲב֞וּר יִשְׁמַ֤ע הָעָם֙ בְּדַבְּרִ֣י עִמָּ֔ךְ וְגַם־בְּךָ֖ יַאֲמִ֣ינוּ לְעוֹלָ֑ם וַיַּגֵּ֥ד מֹשֶׁ֛ה אֶת־דִּבְרֵ֥י הָעָ֖ם אֶל־יְהוָֽה׃
(1) On the third new moon after the Israelites had gone forth from the land of Egypt, on that very day, they entered the wilderness of Sinai. (2) Having journeyed from Rephidim, they entered the wilderness of Sinai and encamped in the wilderness. Israel encamped there in front of the mountain, (3) and Moses went up to God. The LORD called to him from the mountain, saying, “Thus shall you say to the house of Jacob and declare to the children of Israel: (4) ‘You have seen what I did to the Egyptians, how I bore you on eagles’ wings and brought you to Me. (5) Now then, if you will obey Me faithfully and keep My covenant, you shall be My treasured possession among all the peoples. Indeed, all the earth is Mine, (6) but you shall be to Me a kingdom of priests and a holy nation.’ These are the words that you shall speak to the children of Israel.” (7) Moses came and summoned the elders of the people and put before them all that the LORD had commanded him. (8) All the people answered as one, saying, “All that the LORD has spoken we will do!” And Moses brought back the people’s words to the LORD. (9) And the LORD said to Moses, “I will come to you in a thick cloud, in order that the people may hear when I speak with you and so trust you ever after.” Then Moses reported the people’s words to the LORD,

The later portions of Exodus 19 result because of Bo, Beshelach, and the exodus from Egypt. One of the most important phrases of this chapter is the 8th verse where the Israelites are thankful for God guiding them to the Holy Land. And because of this, God forgives mistakes, tries to do right to the Jews, and allows the purpose of Shavuot to be in existence.

CONCLUSION: Exodus 19 is a very important chapter in the Tanakh. It holds many key words of wisdom, foreshadows later events, is an amazing prelude to Exodus 20 (and the revelation at Sinai), and is just really GOOD!