(א) אֵין דּוֹרְשִׁין בַּעֲרָיוֹת בִּשְׁלֹשָׁה. וְלֹא בְמַעֲשֵׂה בְרֵאשִׁית בִּשְׁנַיִם. וְלֹא בַמֶּרְכָּבָה בְּיָחִיד, אֶלָּא אִם כֵּן הָיָה חָכָם וּמֵבִין מִדַּעְתּוֹ. כָּל הַמִּסְתַּכֵּל בְּאַרְבָּעָה דְּבָרִים, רָאוּי לוֹ כְּאִלּוּ לֹא בָּא לָעוֹלָם, מַה לְּמַעְלָה, מַה לְּמַטָּה, מַה לְּפָנִים, וּמַה לְּאָחוֹר. וְכָל שֶׁלֹּא חָס עַל כְּבוֹד קוֹנוֹ, רָאוּי לוֹ שֶׁלֹּא בָּא לָעוֹלָם:
(1) One may not expound the topic of forbidden sexual relations before three or more individuals; nor may one expound the act of Creation and the secrets of the beginning of the world before two or more individuals; nor may one expound by oneself the Design of the Divine Chariot, a mystical teaching with regard to the ways God conducts the world, unless he is wise and understands most matters on his own. The mishna continues in the same vein: Whoever looks at four matters, it would have been better for him had he never entered the world: Anyone who reflects upon what is above the firmament and what is below the earth, what was before Creation, and what will be after the end of the world. And anyone who has no concern for the honor of his Maker, deserves to have never come to the world.
וּמִי דָּרְשִׁינַן בְּחַשְׁמַל? וְהָא הָהוּא יָנוֹקָא דִּדְרַשׁ בְּחַשְׁמַל, וּנְפַקָא נוּרָא וַאֲכַלְתֵּיהּ!
The Gemara poses a question: And may one teach about the electrum of the Design of the Divine Chariot at all? But wasn’t there a certain youth who expounded the electrum, and fire came out and consumed him, showing that such study is highly dangerous?
...אֵין מַפְטִירִין בַּמֶּרְכָּבָה (יחזקאל א), וְרַבִּי יְהוּדָה מַתִּיר.
...One may not conclude the Torah reading with by reading from the Prophets the account of the Divine Chariot (Ezekiel, chapter 1), so as not to publicize that which was meant to remain hidden. And Rabbi Yehuda permits it.
ויחנו במדבר. נתנה תורה דימוס פרהסייא במקום הפקר, שאלו נתנה בארץ ישראל, היו אומרים לאומות העולם אין להם חלק בה, לפיכך נתנה במדבר דימוס פרהסייא במקום הפקר, וכל הרוצה לקבל יבא ויקבל.
"and they encamped in the desert": The Torah was given openly, in a public place. For if it were given in Eretz Yisrael, they could say to the nations of the world: You have no portion in it. But it was given openly, in a public place, and all who want to take it may come and take it.
...שַׁבָּת שֶׁל מִי הָיְתָה? שַׁבָּת שֶׁל רַבִּי אֶלְעָזָר בֶּן עֲזַרְיָה הָיְתָה. וּבַמֶּה הָיְתָה הַגָּדָה הַיּוֹם? ...אַף אַתָּה, עֲשֵׂה אׇזְנֶיךָ כַּאֲפַרְכֶּסֶת, וּקְנֵה לְךָ לֵב מֵבִין לִשְׁמוֹעַ אֶת דִּבְרֵי מְטַמְּאִים וְאֶת דִּבְרֵי מְטַהֲרִים, אֶת דִּבְרֵי אוֹסְרִין וְאֶת דִּבְרֵי מַתִּירִין, אֶת דִּבְרֵי פוֹסְלִין וְאֶת דִּבְרֵי מַכְשִׁירִין.
...Whose week was it, i.e. who was the lecturer this week? They said to him: It was Rabbi Elazar ben Azarya’s week. He inquired: And on what subject was the lecture today? ...So too you, the student, make your ears like a funnel and acquire for yourself an understanding heart to hear both the statements of those who render objects ritually impure and the statements of those who render them pure; the statements of those who prohibit actions and the statements of those who permit them; the statements of those who deem items invalid and the statements of those who deem them valid.
זה אלי ואנוהו. רבי אלעזר אומר מנין שראתה שפחה על הים מה שלא ראו ישעיה ויחזקאל שנ' (הושע י"ב י"א) וביד הנביאים אדמה: ואומר (יחזקאל א' א') נפתחו השמים ואראה מראות אלהים
“This is my Lord and I shall Exalt Him” - Rabbi Elazar says: From where do we know that a maidservant saw at the Sea more than what even Isaiah and Ezekiel ever saw? As it says “And spoke parables through the prophets” (Hosea 11:12), and “the heavens opened and I saw visions of God” (Ezekiel 1:1). - Mekhilta d’Rabi Shimon bar Yochai 15:2