The Songs and Psalms of the Children of Korach)

(כז) וַיֵּעָל֗וּ מֵעַ֧ל מִשְׁכַּן־קֹ֛רֶח דָּתָ֥ן וַאֲבִירָ֖ם מִסָּבִ֑יב וְדָתָ֨ן וַאֲבִירָ֜ם יָצְא֣וּ נִצָּבִ֗ים פֶּ֚תַח אָֽהֳלֵיהֶ֔ם וּנְשֵׁיהֶ֥ם וּבְנֵיהֶ֖ם וְטַפָּֽם׃ (כח) וַיֹּאמֶר֮ מֹשֶׁה֒ בְּזֹאת֙ תֵּֽדְע֔וּן כִּֽי־יקוק שְׁלָחַ֔נִי לַעֲשׂ֕וֹת אֵ֥ת כָּל־הַֽמַּעֲשִׂ֖ים הָאֵ֑לֶּה כִּי־לֹ֖א מִלִּבִּֽי׃ (כט) אִם־כְּמ֤וֹת כָּל־הָֽאָדָם֙ יְמֻת֣וּן אֵ֔לֶּה וּפְקֻדַּת֙ כָּל־הָ֣אָדָ֔ם יִפָּקֵ֖ד עֲלֵיהֶ֑ם לֹ֥א יקוק שְׁלָחָֽנִי׃ (ל) וְאִם־בְּרִיאָ֞ה יִבְרָ֣א יקוק וּפָצְתָ֨ה הָאֲדָמָ֤ה אֶת־פִּ֙יהָ֙ וּבָלְעָ֤ה אֹתָם֙ וְאֶת־כָּל־אֲשֶׁ֣ר לָהֶ֔ם וְיָרְד֥וּ חַיִּ֖ים שְׁאֹ֑לָה וִֽידַעְתֶּ֕ם כִּ֧י נִֽאֲצ֛וּ הָאֲנָשִׁ֥ים הָאֵ֖לֶּה אֶת־יקוק׃ (לא) וַיְהִי֙ כְּכַלֹּת֔וֹ לְדַבֵּ֕ר אֵ֥ת כָּל־הַדְּבָרִ֖ים הָאֵ֑לֶּה וַתִּבָּקַ֥ע הָאֲדָמָ֖ה אֲשֶׁ֥ר תַּחְתֵּיהֶֽם׃ (לב) וַתִּפְתַּ֤ח הָאָ֙רֶץ֙ אֶת־פִּ֔יהָ וַתִּבְלַ֥ע אֹתָ֖ם וְאֶת־בָּתֵּיהֶ֑ם וְאֵ֤ת כָּל־הָאָדָם֙ אֲשֶׁ֣ר לְקֹ֔רַח וְאֵ֖ת כָּל־הָרֲכֽוּשׁ׃

Numbers 16:27-32

(27) So they withdrew from about the abodes of Korah, Dathan, and Abiram. Now Dathan and Abiram had come out and they stood at the entrance of their tents, with their wives, their children, and their little ones. (28) And Moses said, “By this you shall know that it was the LORD who sent me to do all these things; that they are not of my own devising: (29) if these men die as all men do, if their lot be the common fate of all mankind, it was not the LORD who sent me. (30) But if the LORD brings about something unheard-of, so that the ground opens its mouth and swallows them up with all that belongs to them, and they go down alive into Sheol, you shall know that these men have spurned the LORD.” (31) Scarcely had he finished speaking all these words when the ground under them burst asunder, (32) and the earth opened its mouth and swallowed them up with their households, all Korah’s people and all their possessions.

במדבר כ״ו:ט׳-י״א

(ט) וּבְנֵ֣י אֱלִיאָ֔ב נְמוּאֵ֖ל וְדָתָ֣ן וַאֲבִירָ֑ם הֽוּא־דָתָ֨ן וַאֲבִירָ֜ם קרואי [קְרִיאֵ֣י] הָעֵדָ֗ה אֲשֶׁ֨ר הִצּ֜וּ עַל־מֹשֶׁ֤ה וְעַֽל־אַהֲרֹן֙ בַּעֲדַת־קֹ֔רַח בְּהַצֹּתָ֖ם עַל־יקוק׃ (י) וַתִּפְתַּ֨ח הָאָ֜רֶץ אֶת־פִּ֗יהָ וַתִּבְלַ֥ע אֹתָ֛ם וְאֶת־קֹ֖רַח בְּמ֣וֹת הָעֵדָ֑ה בַּאֲכֹ֣ל הָאֵ֗שׁ אֵ֣ת חֲמִשִּׁ֤ים וּמָאתַ֙יִם֙ אִ֔ישׁ וַיִּהְי֖וּ לְנֵֽס׃ (יא) וּבְנֵי־קֹ֖רַח לֹא־מֵֽתוּ׃ (ס)

Numbers 26:9-11

(9) The sons of Eliab were Nemuel, and Dathan and Abiram. These are the same Dathan and Abiram, chosen in the assembly, who agitated against Moses and Aaron as part of Korah’s band when they agitated against the LORD. (10) Whereupon the earth opened its mouth and swallowed them up with Korah—when that band died, when the fire consumed the two hundred and fifty men—and they became an example. (11) The sons of Korah, however, did not die.

סנהדרין ק״י א:י״ז

(במדבר כו, יא) ובני קרח לא מתו תנא משום רבינו אמרו מקום נתבצר להם בגיהנם וישבו עליו ואמרו שירה אמר רבה בר בר חנה זימנא חדא הוה קאזלינא באורחא אמר לי ההוא טייעא תא ואחוי לך בלועי דקרח אזיל חזא תרי בזעי דהוה קא נפק קיטרא מנייהו שקל גבבא דעמרא אמשיי' מיא ואותביה בריש רומחיה ואחלפי' התם איחרך א"ל אצית מה שמעת ושמעית דהוו קאמרי הכי משה ותורתו אמת והן בדאים

Sanhedrin 110a:17

"And the children of Korach did not die." It was taught in the name of our Rabbi: they were gathered and put in a place in Gehennom where they stayed and recited a song.

Rabbah bar bar Chanah said: One time, I was walking along the road. An arab merchant said to me, "Come, and I will show you "the swallowed ones of Korach."" He went and showed two cracks [in the ground] and smoke was coming out of it.... He said to me, "Listen to what you're about to hear." I heard that they were singing, "Moshe and his Torah are True, and we were wrong!"

What song were the children of Korach singing?

--> Maharsha: Psalm 88

--> Zohar: Psalm 48

תהילים מ״ח

(א) שִׁ֥יר מִ֝זְמוֹר לִבְנֵי־קֹֽרַח׃ (ב) גָּ֘ד֤וֹל יקוק וּמְהֻלָּ֣ל מְאֹ֑ד בְּעִ֥יר אֱ֝לֹקֵ֗ינוּ הַר־קָדְשֽׁוֹ׃ (ג) יְפֵ֥ה נוֹף֮ מְשׂ֪וֹשׂ כָּל־הָ֫אָ֥רֶץ הַר־צִ֭יּוֹן יַרְכְּתֵ֣י צָפ֑וֹן קִ֝רְיַ֗ת מֶ֣לֶךְ רָֽב׃ (ד) אֱלֹקִ֥ים בְּאַרְמְנוֹתֶ֗יהָ נוֹדַ֥ע לְמִשְׂגָּֽב׃ (ה) כִּֽי־הִנֵּ֣ה הַ֭מְּלָכִים נֽוֹעֲד֑וּ עָבְר֥וּ יַחְדָּֽו׃ (ו) הֵ֣מָּה רָ֭אוּ כֵּ֣ן תָּמָ֑הוּ נִבְהֲל֥וּ נֶחְפָּֽזוּ׃ (ז) רְ֭עָדָה אֲחָזָ֣תַם שָׁ֑ם חִ֝֗יל כַּיּוֹלֵֽדָה׃ (ח) בְּר֥וּחַ קָדִ֑ים תְּ֝שַׁבֵּ֗ר אֳנִיּ֥וֹת תַּרְשִֽׁישׁ׃ (ט) כַּאֲשֶׁ֤ר שָׁמַ֨עְנוּ ׀ כֵּ֤ן רָאִ֗ינוּ בְּעִיר־יקוק צְ֭בָאוֹת בְּעִ֣יר אֱלֹקֵ֑ינוּ אֱלֹ֘קִ֤ים יְכוֹנְנֶ֖הָ עַד־עוֹלָ֣ם סֶֽלָה׃ (י) דִּמִּ֣ינוּ אֱלֹקִ֣ים חַסְדֶּ֑ךָ בְּ֝קֶ֗רֶב הֵיכָלֶֽךָ׃ (יא) כְּשִׁמְךָ֤ אֱלֹקִ֗ים כֵּ֣ן תְּ֭הִלָּתְךָ עַל־קַצְוֵי־אֶ֑רֶץ צֶ֝֗דֶק מָלְאָ֥ה יְמִינֶֽךָ׃ (יב) יִשְׂמַ֤ח ׀ הַר־צִיּ֗וֹן תָּ֭גֵלְנָה בְּנ֣וֹת יְהוּדָ֑ה לְ֝מַ֗עַן מִשְׁפָּטֶֽיךָ׃ (יג) סֹ֣בּוּ צִ֭יּוֹן וְהַקִּיפ֑וּהָ סִ֝פְר֗וּ מִגְדָּלֶֽיהָ׃ (יד) שִׁ֤יתוּ לִבְּכֶ֨ם ׀ לְֽחֵילָ֗ה פַּסְּג֥וּ אַרְמְנוֹתֶ֑יהָ לְמַ֥עַן תְּ֝סַפְּר֗וּ לְד֣וֹר אַחֲרֽוֹן׃ (טו) כִּ֤י זֶ֨ה ׀ אֱלֹקִ֣ים אֱ֭לֹקֵינוּ עוֹלָ֣ם וָעֶ֑ד ה֖וּא יְנַהֲגֵ֣נוּ עַל־מֽוּת׃

Psalms 48

(1) A song. A psalm of the Korahites. (2) The LORD is great and much acclaimed in the city of our God, His holy mountain— (3) fair-crested, joy of all the earth, Mount Zion, summit of Zaphon, city of the great king. (4) Through its citadels, God has made Himself known as a haven. (5) See, the kings joined forces; they advanced together. (6) At the mere sight of it they were stunned, they were terrified, they panicked; (7) they were seized there with a trembling, like a woman in the throes of labor, (8) as the Tarshish fleet was wrecked in an easterly gale. (9) The likes of what we heard we have now witnessed in the city of the LORD of hosts, in the city of our God— may God preserve it forever!Selah. (10) In Your temple, God, we meditate upon Your faithful care. (11) The praise of You, God, like Your name, reaches to the ends of the earth; Your right hand is filled with beneficence. (12) Let Mount Zion rejoice! Let the towns of Judah exult, because of Your judgments. (13) Walk around Zion, circle it; count its towers, (14) take note of its ramparts; go through its citadels, that you may recount it to a future age. (15) For God—He is our God forever; He will lead us evermore.

According to the Zohar's understanding, why would Bnei Korach sing this particular chapter of Tehillim?

--> Korach instigated an insurrection, a division amongst the Israelites. Tehillim 48 looks to Jerusalem as a unifying force, a space that will be united in the future yemot HaMashiach.

--> A further connection is that it is sung as shir shel yom for Mondays. Monday was the only day of Bereishit in which the phrase "ki tov" was not uttered, due to the fact that on that day division - havdalah - was brought into the world, through the separation of mayim va'rakia.

תהילים פ״ח

(א) שִׁ֥יר מִזְמ֗וֹר לִבְנֵ֫י קֹ֥רַח לַמְנַצֵּ֣חַ עַל־מָחֲלַ֣ת לְעַנּ֑וֹת מַ֝שְׂכִּ֗יל לְהֵימָ֥ן הָאֶזְרָחִֽי׃ (ב) יקוק אֱלֹקֵ֣י יְשׁוּעָתִ֑י יוֹם־צָעַ֖קְתִּי בַלַּ֣יְלָה נֶגְדֶּֽךָ׃ (ג) תָּב֣וֹא לְ֭פָנֶיךָ תְּפִלָּתִ֑י הַטֵּֽה־אָ֝זְנְךָ֗ לְרִנָּתִֽי׃ (ד) כִּֽי־שָֽׂבְעָ֣ה בְרָע֣וֹת נַפְשִׁ֑י וְחַיַּ֗י לִשְׁא֥וֹל הִגִּֽיעוּ׃ (ה) נֶ֭חְשַׁבְתִּי עִם־י֣וֹרְדֵי ב֑וֹר הָ֝יִ֗יתִי כְּגֶ֣בֶר אֵֽין־אֱיָֽל׃ (ו) בַּמֵּתִ֗ים חָ֫פְשִׁ֥י כְּמ֤וֹ חֲלָלִ֨ים ׀ שֹׁ֥כְבֵי קֶ֗בֶר אֲשֶׁ֤ר לֹ֣א זְכַרְתָּ֣ם ע֑וֹד וְ֝הֵ֗מָּה מִיָּדְךָ֥ נִגְזָֽרוּ׃ (ז) שַׁ֭תַּנִי בְּב֣וֹר תַּחְתִּיּ֑וֹת בְּ֝מַחֲשַׁכִּ֗ים בִּמְצֹלֽוֹת׃ (ח) עָ֭לַי סָמְכָ֣ה חֲמָתֶ֑ךָ וְכָל־מִ֝שְׁבָּרֶ֗יךָ עִנִּ֥יתָ סֶּֽלָה׃ (ט) הִרְחַ֥קְתָּ מְיֻדָּעַ֗י מִ֫מֶּ֥נִּי שַׁתַּ֣נִי תוֹעֵב֣וֹת לָ֑מוֹ כָּ֝לֻ֗א וְלֹ֣א אֵצֵֽא׃ (י) עֵינִ֥י דָאֲבָ֗ה מִנִּ֫י עֹ֥נִי קְרָאתִ֣יךָ יקוק בְּכָל־י֑וֹם שִׁטַּ֖חְתִּי אֵלֶ֣יךָ כַפָּֽי׃ (יא) הֲלַמֵּתִ֥ים תַּעֲשֶׂה־פֶּ֑לֶא אִם־רְ֝פָאִ֗ים יָק֤וּמוּ ׀ יוֹד֬וּךָ סֶּֽלָה׃ (יב) הַיְסֻפַּ֣ר בַּקֶּ֣בֶר חַסְדֶּ֑ךָ אֱ֝מֽוּנָתְךָ֗ בָּאֲבַדּֽוֹן׃ (יג) הֲיִוָּדַ֣ע בַּחֹ֣שֶׁךְ פִּלְאֶ֑ךָ וְ֝צִדְקָתְךָ֗ בְּאֶ֣רֶץ נְשִׁיָּֽה׃ (יד) וַאֲנִ֤י ׀ אֵלֶ֣יךָ יקוק שִׁוַּ֑עְתִּי וּ֝בַבֹּ֗קֶר תְּֽפִלָּתִ֥י תְקַדְּמֶֽךָּ׃ (טו) לָמָ֣ה יקוק תִּזְנַ֣ח נַפְשִׁ֑י תַּסְתִּ֖יר פָּנֶ֣יךָ מִמֶּֽנִּי׃ (טז) עָ֘נִ֤י אֲנִ֣י וְגֹוֵ֣עַ מִנֹּ֑עַר נָשָׂ֖אתִי אֵמֶ֣יךָ אָפֽוּנָה׃ (יז) עָ֭לַי עָבְר֣וּ חֲרוֹנֶ֑יךָ בִּ֝עוּתֶ֗יךָ צִמְּתוּתֻֽנִי׃ (יח) סַבּ֣וּנִי כַ֭מַּיִם כָּל־הַיּ֑וֹם הִקִּ֖יפוּ עָלַ֣י יָֽחַד׃ (יט) הִרְחַ֣קְתָּ מִ֭מֶּנִּי אֹהֵ֣ב וָרֵ֑עַ מְֽיֻדָּעַ֥י מַחְשָֽׁךְ׃

Psalms 88

(1) A song. A psalm of the Korahites. For the leader; on maḥalath leannoth. A maskil of Heman the Ezrahite. (2) O LORD, God of my deliverance, when I cry out in the night before You, (3) let my prayer reach You; incline Your ear to my cry. (4) For I am sated with misfortune; I am at the brink of Sheol. (5) I am numbered with those who go down to the Pit; I am a helpless man (6) abandoned among the dead, like bodies lying in the grave of whom You are mindful no more, and who are cut off from Your care. (7) You have put me at the bottom of the Pit, in the darkest places, in the depths. (8) Your fury lies heavy upon me; You afflict me with all Your breakers.Selah. (9) You make my companions shun me; You make me abhorrent to them; I am shut in and do not go out. (10) My eyes pine away from affliction; I call to You, O LORD, each day; I stretch out my hands to You. (11) Do You work wonders for the dead? Do the shades rise to praise You?Selah. (12) Is Your faithful care recounted in the grave, Your constancy in the place of perdition? (13) Are Your wonders made known in the netherworld, Your beneficent deeds in the land of oblivion? (14) As for me, I cry out to You, O LORD; each morning my prayer greets You. (15) Why, O LORD, do You reject me, do You hide Your face from me? (16) From my youth I have been afflicted and near death; I suffer Your terrors wherever I turn. (17) Your fury overwhelms me; Your terrors destroy me. (18) They swirl about me like water all day long; they encircle me on every side. (19) You have put friend and neighbor far from me and my companions out of my sight.

Why do you think the Maharsha would have suggested Psalm 88 as the one the children of Korach were singing?