כִּ֚י אִם־בֹּ֣א אַתָּ֔ה עֲשֵׂ֖ה חֲזַ֣ק לַמִּלְחָמָ֑ה יַכְשִֽׁילְךָ֤ הָֽאֱלֹהִים֙ לִפְנֵ֣י אוֹיֵ֔ב כִּ֥י יֶשׁ־כֹּ֛חַ בֵּאלֹהִ֖ים לַעְז֥וֹר וּלְהַכְשִֽׁיל׃
Tetapi pergilah engkau sendiri; bertindaklah, kuatkanlah dirimu untuk berperang. Jika tidak, Allah dapat membuat engkau tersungkur di hadapan musuh, sebab pada Allah ada kuasa untuk menolong dan untuk menjatuhkan.”
Rashi
But if you come The meaning is: If you do not believe my words, will you not try [to put effort into your military campaign?] Come, do, and strengthen yourself for war.
Rashi
to help or to cause to stumble The meaning is: He has the strength to help you without the army of Ephraim and to cause you to stumble if you take them with you.