Deuteronomy 20:2

כקרבכם אל המלחמה [IT SHALL BE] WHEN YE COME NIGH UNTO THE BATTLE, [THAT THE PRIEST … SHALL SPEAK] — i.e. when ye are on the point of leaving the ספר — the boundary of your land (Sifrei Devarim 191). ונגש הכהן AND “THE” PRIEST SHALL STEP NIGH [AND SPEAK] “the” priest means, he who has been anointed for that purpose; it is the one who is termed in the Talmud משוח מלחמה, “the priest anointed for war” (Sotah 42a). ודבר אל העם AND HE SHALL SPEAK UNTO THE PEOPLE — in the Holy Language (Sotah 42a).

וְהָיָ֕ה כְּקָֽרׇבְכֶ֖ם אֶל־הַמִּלְחָמָ֑ה וְנִגַּ֥שׁ הַכֹּהֵ֖ן וְדִבֶּ֥ר אֶל־הָעָֽם׃

And it shall be, when you are come near to the battle, that the priest shall approach and speak to the people, and shall say to them,