וַיִּֽתְקַבְּצ֣וּ אֵ֠לָיו כָּל־אִ֨ישׁ מָצ֜וֹק וְכָל־אִ֨ישׁ אֲשֶׁר־ל֤וֹ נֹשֶׁא֙ וְכָל־אִ֣ישׁ מַר־נֶ֔פֶשׁ וַיְהִ֥י עֲלֵיהֶ֖ם לְשָׂ֑ר וַיִּהְי֣וּ עִמּ֔וֹ כְּאַרְבַּ֥ע מֵא֖וֹת אִֽישׁ׃
And every one that was in distress, and every one that was in debt, and every one that was discontented, gathered themselves unto him; and he became captain over them; and there were with him about four hundred men.
Read Kabbalistic (mystical) interpretations of I Samuel 22:2: Zohar and classical Jewish mystical sources, free online.