Be of good courage, and let us prove strong for our people, and for the cities of our God; and Hashem do that which seemeth Him good.
חֲזַק וְנִתְחַזַּק בְּעַד עַמֵּנוּ וּבְעַד עָרֵי אֱלֹהֵינוּ וַיהוָה יַעֲשֶׂה הַטּוֹב בְּעֵינָיו
kha-ZAK v’-nit-kha-ZAK b’-AD a-MAY-nu u-v’-AD a-RAY e-lo-HAY-nu va-do-NAI ya-a-SEH ha-TOV b’-ay-NAV
Joab instructs his soldiers in much the same way as today’s soldiers of Israel are instructed. The soldiers must strengthen themselves to go into battle for the People of Israel and to protect the cities of God. God will respond by doing what is right in His eyes. Ralbag notes that in most cases, God expects of humans to do their part and not to rely on His performing a miracle. Once people do what is expected, God may choose to provide miracles and redemption. This is a daily occurrence with the soldiers of the Israeli Defense Forces who strengthen themselves for battle, and have often been rewarded by God with miracles.