וַיֹּ֧אמֶר דָּוִ֛ד אֶל־אִתַּ֖י לֵ֣ךְ וַעֲבֹ֑ר וַֽיַּעֲבֹ֞ר אִתַּ֤י הַגִּתִּי֙ וְכָל־אֲנָשָׁ֔יו וְכָל־הַטַּ֖ף אֲשֶׁ֥ר אִתּֽוֹ׃
And David said to Ittai: ‘Go and pass over.’ And Ittai the Gittite passed over, and all his men, and all the little ones that were with him.
Read midrashic interpretation of II Samuel 15:22: and classical rabbinic exegesis.