Ittai
Two men named Ittai stand in David's service. The first is Ittai the Gittite, a Philistine-city exile who joins David's column on the flight from Absalom and refuses to be sent back. The second is Ittai the son of Ribai, a Benjamite from Gibeah enrolled in the thirty mighty-men roll. The Gittite carries the bulk of the narrative in 2 Samuel 15-18; the Benjamite appears once in the hero-list of 2 Sa 23 and once in its 1 Chronicles parallel, where the spelling shifts to Ithai.
Ittai the Gittite on the flight from Absalom
When David leaves Jerusalem ahead of Absalom, Ittai the Gittite is in his column, and David tries to send him back. "Then the king said to Ittai the Gittite, Why do you also go with us? Return, and remain with the king: for you are a foreigner, and also an exile; [return] to your own place" (2Sa 15:19). The Gittite gentilic identifies him as a man from the Philistine city of Gath; the foreigner-and-exile pairing grounds the dismissal in his non-Israelite status, and the "remain with the king" instruction reclassifies Absalom as the king now in Jerusalem.
David presses the point a second time on the ground that Ittai has barely arrived: "Whereas you came but yesterday, should I this day make you go up and down with us, seeing I go where I may? Return, and take back your brothers with you; and may Yahweh show you mercy and truth" (2Sa 15:20). The send-back is offered as honorable — a Yahweh-mercy-and-truth blessing rather than a rebuke.
Ittai's reply binds himself to David by an oath that pairs Yahweh's name with the king's: "As Yahweh lives, and as my lord the king lives, surely in what place my lord the king will be, whether to death or to life, even there also will your slave be" (2Sa 15:21). The double oath-formula, the slave-language, and the death-or-life clause refuse the dismissal outright.
David reverses: "And David said to Ittai, Go and pass over. And Ittai the Gittite passed over, and all his men, and all the little ones who were with him" (2Sa 15:22). The Gittite goes through with David, with his fighting men and his household.
Ittai the Gittite as third-commander
When David draws up his army to meet Absalom, Ittai the Gittite holds one of three commands. "And David divided the people in three [parts], a third part under the hand of Joab, and a third part under the hand of Abishai the son of Zeruiah, Joab's brother, and a third part under the hand of Ittai the Gittite. And the king said to the people, I will surely go forth with you⁺ myself also" (2Sa 18:2). The not-sent-back foreigner of the previous chapter now commands a third of the royal host alongside the two sons of Zeruiah.
The deal-gently-with-Absalom charge that follows names the same three captains: "And the king commanded Joab and Abishai and Ittai, saying, Deal gently for my sake with the young man, even with Absalom. And all the people heard when the king gave all the captains charge concerning Absalom" (2Sa 18:5). Ittai is again paired with Joab and Abishai as one of the three to whom the king's request about his son is given.
Ittai the Benjamite among the thirty
A separate man of the same name appears in the thirty mighty-men roll. "Heleb the son of Baanah the Netophathite, Ittai the son of Ribai of Gibeah of the sons of Benjamin," (2Sa 23:29). The son-of-Ribai patronym fixes his father; the of-Gibeah locative places him in Saul's old home-town; the of-the-sons-of-Benjamin gentilic binds him to the Benjamite tribe; and his slot inside the named-hero roll enrolls him in David's second-tier hero-corps.
The 1 Chronicles parallel carries the same man with a spelling shift: "Ithai the son of Ribai of Gibeah of the sons of Benjamin, Benaiah the Pirathonite," (1Ch 11:31). Same patronym, same town, same tribe — the form "Ithai" stands in for "Ittai" in UPDV's Chronicles text.
This Benjamite Ibhite is a distinct figure from the Gittite of the flight-from-Absalom chapters: the Gittite is a Philistine-city exile commanding a third of the army; the Benjamite is a Gibeahite hero on the thirty-list. The shared name is the principal point of contact between the two figures within this surveyed witness.