וַיֵּרְד֡וּ שְֽׁלוֹשָׁה֩ מִן־הַשְּׁלוֹשִׁ֨ים רֹ֤אשׁ עַל־הַצֻּר֙ אֶל־דָּוִ֔יד אֶל־מְעָרַ֖ת עֲדֻלָּ֑ם וּמַחֲנֵ֣ה פְלִשְׁתִּ֔ים חֹנָ֖ה בְּעֵ֥מֶק רְפָאִֽים׃
And three of the thirty chiefs went down to the rock to David, unto the cave of Adullam; and the host of the Philistines were encamped in the valley of Rephaim.
Read midrashic interpretation of I Chronicles 11:15: and classical rabbinic exegesis.