וַיֵּ֣לֶךְ דָּוִ֗ד ה֚וּא וְשֵׁשׁ־מֵא֥וֹת אִישׁ֙ אֲשֶׁ֣ר אִתּ֔וֹ וַיָּבֹ֖אוּ עַד־נַ֣חַל הַבְּשׂ֑וֹר וְהַנּֽוֹתָרִ֖ים עָמָֽדוּ׃
So David went, he and the six hundred men that were with him, and came to the brook Besor, where those that were left behind stayed.
Read midrashic interpretation of I Samuel 30:9: and classical rabbinic exegesis.