וַיִּפְנ֞וּ וַיָּנֻ֤סוּ הַמִּדְבָּ֙רָה֙ אֶל־סֶ֣לַע הָֽרִמּ֔וֹן שֵׁ֥שׁ מֵא֖וֹת אִ֑ישׁ וַיֵּֽשְׁבוּ֙ בְּסֶ֣לַע רִמּ֔וֹן אַרְבָּעָ֖ה חֳדָשִֽׁים׃
But six hundred men turned and fled toward the wilderness unto the rock of Rimmon, and abode in the rock of Rimmon four months.
Read midrashic interpretation of Judges 20:47: and classical rabbinic exegesis.