John Gill Commentary Deuteronomy 20:4

"for Jehovah your God is he that goeth with you, to fight for you against your enemies, to save you." — Deuteronomy 20:4 (ASV)

For the Lord your God is he that goes with you
To battle, and therefore they had no reason to fear and be dismayed, to be fainthearted, terrified, and tremble:

fear not, I am with you
(Isaiah 41:10) , this, according to the Misnah ^F6 , respects the ark, and so Jarchi, which was a symbol of the divine Presence, and went with them to battle; see (Joshua 6:4) (1 Samuel 4:3–5)

to fight for you against your enemies, to save you ;
to annoy and destroy the one, and to protect and save the other; thus far the anointed priest addressed the people in an oration to this purpose: the account Maimonides gives of it is, that "when they have set their ranks, and are near to a battle, the anointed of war stands on an high place, and all the ranks before him, and says to them in the holy tongue, 'hear, O Israel' unto to save you; and then another priest under him causes it to be heard by all the people with an high voice ^F7 ;" he repeated what the anointed of war had said, and expressed it with a loud voice, that all might hear.

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FOOTNOTES:

• F6: Ut supra. (Misn. Sotab, c. 8. sect. 1.)
• F7: Hilchot Melachim, c. 7. sect. 3.