Talmud for Sotah 8:1
מְשׁוּחַ מִלְחָמָה, בְּשָׁעָה שֶׁמְּדַבֵּר אֶל הָעָם, בִּלְשׁוֹן הַקֹּדֶשׁ הָיָה מְדַבֵּר, שֶׁנֶּאֱמַר (דברים כ) וְהָיָה כְּקָרָבְכֶם אֶל הַמִּלְחָמָה וְנִגַּשׁ הַכֹּהֵן, זֶה כֹּהֵן מְשׁוּחַ מִלְחָמָה, וְדִבֶּר אֶל הָעָם, בִּלְשׁוֹן הַקֹּדֶשׁ. וְאָמַר אֲלֵיהֶם (שם) שְׁמַע יִשְׂרָאֵל אַתֶּם קְרֵבִים הַיּוֹם לַמִּלְחָמָה עַל אֹיְבֵיכֶם, וְלֹא עַל אֲחֵיכֶם, לֹא יְהוּדָה עַל שִׁמְעוֹן, וְלֹא שִׁמְעוֹן עַל בִּנְיָמִין, שֶׁאִם תִּפְּלוּ בְיָדָם יְרַחֲמוּ עֲלֵיכֶם, כְּמָה שֶׁנֶּאֱמַר (דה"ב כח) וַיָּקֻמוּ הָאֲנָשִׁים אֲשֶׁר נִקְּבוּ בְשֵׁמוֹת וַיַּחֲזִיקוּ בַשִּׁבְיָה וְכָל מַעֲרֻמֵּיהֶם הִלְבִּישׁוּ מִן הַשָּׁלָל וַיַּלְבִּשֻׁם וַיַּנְעִלּוּם וַיַּאֲכִלוּם וַיַּשְׁקוּם וַיְסֻכוּם וַיְנַהֲלוּם בַּחֲמֹרִים לְכָל כּוֹשֵׁל וַיְבִיאוּם יְרֵחוֹ עִיר הַתְּמָרִים אֵצֶל אֲחֵיהֶם וַיָּשׁוּבוּ שֹׁמְרוֹן. עַל אוֹיְבֵיכֶם אַתֶּם הוֹלְכִים, שֶׁאִם תִּפְּלוּ בְיָדָם אֵין מְרַחֲמִין עֲלֵיכֶם. אַל יֵרַךְ לְבַבְכֶם אַל תִּירְאוּ וְאַל תַּחְפְּזוּ וְגוֹ' (דברים כ). אַל יֵרַךְ לְבַבְכֶם, מִפְּנֵי צָהֳלַת סוּסִים וְצִחְצוּחַ חֲרָבוֹת. אַל תִּירְאוּ, מִפְּנֵי הֲגָפַת תְּרִיסִין וְשִׁפְעַת הַקַּלְגַּסִּין. אַל תַּחְפְּזוּ, מִקּוֹל קְרָנוֹת. אַל תַּעַרְצוּ, מִפְּנֵי קוֹל צְוָחוֹת. כִּי ה' אֱלֹהֵיכֶם הַהֹלֵךְ עִמָּכֶם, הֵן בָּאִין בְּנִצְחוֹנוֹ שֶׁל בָּשָׂר וָדָם, וְאַתֶּם בָּאִים בְּנִצְחוֹנוֹ שֶׁל מָקוֹם. פְּלִשְׁתִּים בָּאוּ בְנִצְחוֹנוֹ שֶׁל גָּלְיָת, מֶה הָיָה סוֹפוֹ, לְסוֹף נָפַל בַּחֶרֶב וְנָפְלוּ עִמּוֹ. בְּנֵי עַמּוֹן בָּאוּ בְנִצְחוֹנוֹ שֶׁל שׁוֹבַךְ, מֶה הָיָה סוֹפוֹ, לְסוֹף נָפַל בַּחֶרֶב וְנָפְלוּ עִמּוֹ. וְאַתֶּם אִי אַתֶּם כֵּן. כִּי ה' אֱלֹהֵיכֶם הַהֹלֵךְ עִמָּכֶם לְהִלָּחֵם לָכֶם וְגוֹ', זֶה מַחֲנֵה הָאָרוֹן:
The anointed for battle, at the time he talks to the people, he would speak in the holy tongue, as it is said, “And it shall be, when you draw near the battle, that the priest shall approach” (Deuteronomy 20:2)—this refers to the priest anointed for battle. “And speak to the people” (ibid) – in the holy tongue. “He shall say to them, 'Hear, O Israel, you are about to join battle with your enemy'” (Deuteronomy 20:3)— “with your enemy” but not against your brother, not Judah against Shimon nor Shimon against Benjamin, that if you fall into their hand they shall have mercy on you, as it is said, “Then the men named above proceeded to take the captives in hand, and with booty they clothed all the naked among them—they clothed them and shod them and gave them to eat and drink and anointed them and provide donkeys for all who were failing and brought them to Jericho, the city of palms, back to their kinsmen. Then they returned to Samaria” (II Chronicles 28:15). Rather against your enemies do you march, so that if you fall into their hand they will have no mercy on you. “Let not your courage falter, fear not, and do not tremble or be in dread of them” (Deuteronomy 20:3) “Let not your courage falter”-- at the neighing of the horses and the sharpening of swords; “Fear not” --at the crash of shields and the tramp of the soldiers shoes; “Do not tremble” -- at the sound of trumpets; “Or be in dread of them” -- at the sound of battle cries. “For it is the Lord your God that goes with you”--they come [relying] upon the might of flesh and blood, but you come [relying] upon the might of the Omnipresent. The Philistines came [relying] upon the power of Goliath (I Samuel 17:4), but what happened to him in the end? In the end he fell by the sword and they fell with him. The Ammonites came [relying] upon the power of Shobach (II Samuel 10:16-18), but what happened to him in the end? In the end he fell by the sword and they fell with him. But with you it is not like that, “For it is the Lord your God that goes with you”—this refers to the camp of the ark.