וְיֵֽדְעוּ֙ כָּל־הַקָּהָ֣ל הַזֶּ֔ה כִּֽי־לֹ֛א בְּחֶ֥רֶב וּבַחֲנִ֖ית יְהוֹשִׁ֣יעַ יְהוָ֑ה כִּ֤י לַֽיהוָה֙ הַמִּלְחָמָ֔ה וְנָתַ֥ן אֶתְכֶ֖ם בְּיָדֵֽנוּ׃
and that all this assembly may know that the LORD saveth not with sword and spear; for the battle is the LORD’S, and He will give you into our hand.’
Read halakhic rulings (Jewish law) on I Samuel 17:47: and classical halakhic sources.