申命記 20:1

כי תצא למלחמה WHEN THOU GOEST OUT TO WAR — Scripture places the going out to war in juxtaposition to this section here (to עין בעין וכו׳) in order to tell you that no person lacking a limb goes out to war (cf. Sifrei Devarim 190:17). Another explanation of why these two sections are put in juxtaposition to each other: it is to tell you that if you execute just judgment you may be confident that if you go to war you will be victorious. Similarly does David say, (Psalms 119:121) “I have done judgement and justice; Thou wilt not leave me to my oppressors” (Midrash Tanchuma, Shoftim 15). על איבך AGAINST THINE ENEMIES — Let them be in thine eyes as enemies: have no pity upon them, for they will have no pity upon thee (Midrash Tanchuma, Shoftim 15). סוס ורכב [WHEN THOU GOEST TO WAR ... AND SEEST] HORSES AND CHARIOTS (lit., horse and chariot) — in Mine eyes they are all as only one horse (i.e. they do not count). Similarly it states, (Judges 6:16) “[Surely “I” will be with thee,] and thou shalt smite the Midianites as one man”. And similarly it states, (Exodus 15:19) “For the horse (not the horses) of Pharaoh came [into the sea]” (Midrash Tanchuma, Shoftim 16; cf. Sifrei Devarim 190:21). עם רב ממך [WHEN THOU GOEST OUT TO WAR … AND SEEST] PEOPLE MORE THAN THOU (or, as it may be translated: PEOPLE, NUMEROUS FROM THY POINT OF VIEW) — in thine eyes they may appear to be numerous but in Mine eyes they are not numerous (Midrash Tanchuma, Shoftim 16).

כִּֽי־תֵצֵ֨א לַמִּלְחָמָ֜ה עַל־אֹיְבֶ֗ךָ וְֽרָאִ֜יתָ ס֤וּס וָרֶ֙כֶב֙ עַ֚ם רַ֣ב מִמְּךָ֔ לֹ֥א תִירָ֖א מֵהֶ֑ם כִּֽי־יְהֹוָ֤ה אֱלֹהֶ֙יךָ֙ עִמָּ֔ךְ הַמַּֽעַלְךָ֖ מֵאֶ֥רֶץ מִצְרָֽיִם׃

When thou goest out to battle against thy enemies, and seest horses, and chariots, and a people more numerous than thou, be not afraid of them: for the Lord thy God is with thee, who brought thee up out of the land of Miżrayim.