וַיֹּ֤אמֶר דָּוִד֙ אֶל־שָׁא֔וּל אַל־יִפֹּ֥ל לֵב־אָדָ֖ם עָלָ֑יו עַבְדְּךָ֣ יֵלֵ֔ךְ וְנִלְחַ֖ם עִם־הַפְּלִשְׁתִּ֥י הַזֶּֽה׃
And David said to Saul: ‘Let no man’s heart fail within him; thy servant will go and fight with this Philistine.’
Read halakhic rulings (Jewish law) on I Samuel 17:32: and classical halakhic sources.