
Understand one another very well, agree with each other, as in 'Negotiations went on for days, but finally both sides realized they weren't speaking the same language. This term, alluding to literal understanding of spoken words, dates from the late 1800s.' "
https://www.dictionary.com/browse/speak-the-same-language
(א) וַיְהִ֥י כׇל־הָאָ֖רֶץ שָׂפָ֣ה אֶחָ֑ת וּדְבָרִ֖ים אֲחָדִֽים׃ (ב) וַיְהִ֖י בְּנׇסְעָ֣ם מִקֶּ֑דֶם וַֽיִּמְצְא֥וּ בִקְעָ֛ה בְּאֶ֥רֶץ שִׁנְעָ֖ר וַיֵּ֥שְׁבוּ שָֽׁם׃ (ג) וַיֹּאמְר֞וּ אִ֣ישׁ אֶל־רֵעֵ֗הוּ הָ֚בָה נִלְבְּנָ֣ה לְבֵנִ֔ים וְנִשְׂרְפָ֖ה לִשְׂרֵפָ֑ה וַתְּהִ֨י לָהֶ֤ם הַלְּבֵנָה֙ לְאָ֔בֶן וְהַ֣חֵמָ֔ר הָיָ֥ה לָהֶ֖ם לַחֹֽמֶר׃ (ד) וַיֹּאמְר֞וּ הָ֣בָה ׀ נִבְנֶה־לָּ֣נוּ עִ֗יר וּמִגְדָּל֙ וְרֹאשׁ֣וֹ בַשָּׁמַ֔יִם וְנַֽעֲשֶׂה־לָּ֖נוּ שֵׁ֑ם פֶּן־נָפ֖וּץ עַל־פְּנֵ֥י כׇל־הָאָֽרֶץ׃ (ה) וַיֵּ֣רֶד יהוה לִרְאֹ֥ת אֶת־הָעִ֖יר וְאֶת־הַמִּגְדָּ֑ל אֲשֶׁ֥ר בָּנ֖וּ בְּנֵ֥י הָאָדָֽם׃ (ו) וַיֹּ֣אמֶר יהוה הֵ֣ן עַ֤ם אֶחָד֙ וְשָׂפָ֤ה אַחַת֙ לְכֻלָּ֔ם וְזֶ֖ה הַחִלָּ֣ם לַעֲשׂ֑וֹת וְעַתָּה֙ לֹֽא־יִבָּצֵ֣ר מֵהֶ֔ם כֹּ֛ל אֲשֶׁ֥ר יָזְמ֖וּ לַֽעֲשֽׂוֹת׃ (ז) הָ֚בָה נֵֽרְדָ֔ה וְנָבְלָ֥ה שָׁ֖ם שְׂפָתָ֑ם אֲשֶׁר֙ לֹ֣א יִשְׁמְע֔וּ אִ֖ישׁ שְׂפַ֥ת רֵעֵֽהוּ׃ (ח) וַיָּ֨פֶץ יהוה אֹתָ֛ם מִשָּׁ֖ם עַל־פְּנֵ֣י כׇל־הָאָ֑רֶץ וַֽיַּחְדְּל֖וּ לִבְנֹ֥ת הָעִֽיר׃ (ט) עַל־כֵּ֞ן קָרָ֤א שְׁמָהּ֙ בָּבֶ֔ל כִּי־שָׁ֛ם בָּלַ֥ל יהוה שְׂפַ֣ת כׇּל־הָאָ֑רֶץ וּמִשָּׁם֙ הֱפִיצָ֣ם יהוה עַל־פְּנֵ֖י כׇּל־הָאָֽרֶץ׃ {פ}
(1) Everyone on earth had the same language and the same words. (2) And as they migrated from the east, they came upon a valley in the land of Shinar and settled there. (3) They said to one another, “Come, let us make bricks and burn them hard.”—Brick served them as stone, and bitumen served them as mortar.— (4) And they said, “Come, let us build us a city, and a tower with its top in the sky, to make a name for ourselves; else we shall be scattered all over the world.” (5)יהוה came down to look at the city and tower that humanity had built, (6) and יהוה said, “If, as one people with one language for all, this is how they have begun to act, then nothing that they may propose to do will be out of their reach. (7) Let us, then, go down and confound their speech there, so that they shall not understand one another’s speech.” (8) Thus יהוה scattered them from there over the face of the whole earth; and they stopped building the city. (9) That is why it was called Babel, because there יהוה confounded the speech of the whole earth; and from there יהוה scattered them over the face of the whole earth.
(ז) הָ֚בָה נֵֽרְדָ֔ה וְנָבְלָ֥ה שָׁ֖ם שְׂפָתָ֑ם אֲשֶׁר֙ לֹ֣א יִשְׁמְע֔וּ אִ֖ישׁ שְׂפַ֥ת רֵעֵֽהוּ׃
(7) Let us, then, go down and confound their speech there, so that they shall not understand one another’s speech.”

הָבוּ נִתְגְּלִי וּנְבַלְבֵּל תַּמָּן לִישָׁנְהוֹן דִּלָא יִשְׁמְעוּן אֱנַשׁ (גְּבַר) לִישַׁן חַבְרֵיהּ:
Come, let us descend [let us be revealed] and jumble their language, that they will not understand one another’s language.
(ה) וְאִתְגְלֵי יהוה לְאִיתְפַּרְעָא מִנְהוֹן עַל עוֹבַד קַרְתָּא וּמַגְדְלָא דְבָנוּ בְּנֵי נְשָׁא (ו) וַאֲמַר יהוה הָא עַמָא חָד וְלִישָׁן חָד לְכֻלְהוֹם וְדָא אִתְחַשְׁבוּ לְמֶעֱבַד וּכְדוֹן לָא יִתְמְנַע מִנְהוֹן כָּל דַחֲשִׁיבוּ לְמֶעֱבָד (ז) וַאֲמַר יהוה לְשַׁבְעִין מַלְאָכַיָא דְקַיְימִין קוֹמוֹי אִיתוּן כְּדֵין וְנָחִית וּנְעַרְבְּבָא תַּמָן לִישַׁנְהוֹן דְלָא יִשְׁמְעוּן אֱינַשׁ לִישָׁן חַבְרֵיהּ (ח) וְאִגְלִיאַת מֵימְרָא דַיְיָ עֲלוֹי קַרְתָּא וְעִמֵיהּ שׁוּבְעִין מַלְאָכַיָא כָּל קְבֵל שׁוּבְעִין עַמְמַיָא וְכָל חַד וְחַד לִישָׁן עַמְמֵיהּ (נ"א וְרוֹשָׁם כַּתְבֵיהּ) (וּמִשָׁם כַּפְתֵיהּ) בִּידֵיהּ וּבַדְרִינוּן מִתַּמָן עַל אַנְפֵּי כָּל אַרְעָא לְשַׁבְעִין לִישְׁנִין וְלָא הֲוָה יָדַע חַד מַה דְיֵימַר חַבְרֵיהּ וַהֲווֹ קַטְלִין דֵין לְדֵין וּפְסָקוּ מִלִמִבְנֵי קַרְתָּא
(5) And the Lord was revealed to punish them for the work of the city and the tower which the sons of men builded. (6) And the Lord said, Behold, the people is one, and the language of all of them one: and this they have thought to do: and now they will not be restrained from doing whatever they imagine. (7) And the Lord said to the seventy angels which stand before Him, Come, we will descend and will there commingle their language, that a man shall not understand the speech of his neighbour. (8) And the Word of the Lord was revealed against the city, and with Him seventy angels, having reference to seventy nations, each having its own language, and thence the writing of its own hand: and He dispersed them from thence upon the face of all the earth into seventy languages. And one knew not what his neighbour would say: but one slew the other; and they ceased from building the city.

(ד) וְשָׁפַט֙ בֵּ֣ין הַגּוֹיִ֔ם וְהוֹכִ֖יחַ לְעַמִּ֣ים רַבִּ֑ים וְכִתְּת֨וּ חַרְבוֹתָ֜ם לְאִתִּ֗ים וַחֲנִיתֽוֹתֵיהֶם֙ לְמַזְמֵר֔וֹת לֹא־יִשָּׂ֨א ג֤וֹי אֶל־גּוֹי֙ חֶ֔רֶב וְלֹֽא־יִלְמְד֥וּ ע֖וֹד מִלְחָמָֽה׃ {פ}
(4)Thus [God] will judge among the nationsAnd arbitrate for the many peoples,And they shall beat their swords into plowsharesAnd their spears into pruning hooks:Nation shall not take upSword against nation;They shall never again know war.
