I Samuel 17:19 Midrash

וְשָׁא֤וּל וְהֵ֙מָּה֙ וְכָל־אִ֣ישׁ יִשְׂרָאֵ֔ל בְּעֵ֖מֶק הָֽאֵלָ֑ה נִלְחָמִ֖ים עִם־פְּלִשְׁתִּֽים׃

now Saul, and they, and all the men of Israel, are in the vale of Elah, fighting with the Philistines.’

Read midrashic interpretation of I Samuel 17:19: and classical rabbinic exegesis.