2 Samuel 17:25

25 And Absalom ordained Amasa for Joab upon his host; and Amasa was the son of a man that was called Ithra of Jezreel, the which entered to Abigail, the daughter of Nahash, (and) the sister of Zeruiah, that was the mother of Joab. (And Absalom ordained Amasa upon his army, in Joab's place; and Amasa was the son of a man called Ithra, an Ishmaelite, who entered in to Abigail, who was Nahash's daughter, and Zeruiah's sister, Joab's mother.)

2 Samuel 17:25 Meaning and Commentary

2 Samuel 17:25

And Absalom made Amasa captain of the host instead of Joab,
&c.] Who was along with David:

which Amasa [was] a man's son whose name [was] Ithra, an Israelite;
he is called Jether the Ishmaelite, ( 1 Chronicles 2:17 ) ; either because he was an Ishmaelite by birth, and being proselyted to the Jewish religion, was called an Israelite; or rather he was an Israelite by birth, and having sojourned in the land of Ishmael some time, was called an Ishmaelite, as Uriah the Hittite, and others; and when Amasa is called a "man's son", it means a great man, as Kimchi observes:

that went in to Abigail, the daughter of Nahash, sister to Zeruiah,
Joab's mother:
so that Joab and Amasa, the generals of David and Absalom, were own cousins, sisters' children, and David uncle to them both; for Abigail and Zeruiah were David's sisters, ( 1 Chronicles 2:16 ) ; children of Jesse, whose name is here called Nahash, having two names, or this was his surname; though others think Nahash is the name of a woman, the wife of Jesse, and that these two sisters had two mothers, but one father; it seems by this expression, "went in to", as if Amasa was not begotten in the conjugal state, but was illegitimate.

2 Samuel 17:25 In-Context

23 And Ahithophel saw, that his counsel was not done, and he saddled his ass, and rose up, and went into his house, and into his city; and when his house was disposed, he perished by hanging himself, and he was buried in the sepulchre of his father. (And Ahithophel saw that his advice was not followed, and so he saddled up his donkey, and went back to his house in his city; and after his affairs were in order, he hanged himself, and he was buried in his father's tomb, or his grave.)

24 And David came into the castles, and Absalom passed [over] Jordan, he and all the men of Israel with him. (And as David came to Mahanaim, Absalom, and all the men of Israel who were with him, crossed over the Jordan River.)

25 And Absalom ordained Amasa for Joab upon his host; and Amasa was the son of a man that was called Ithra of Jezreel, the which entered to Abigail, the daughter of Nahash, (and) the sister of Zeruiah, that was the mother of Joab. (And Absalom ordained Amasa upon his army, in Joab's place; and Amasa was the son of a man called Ithra, an Ishmaelite, who entered in to Abigail, who was Nahash's daughter, and Zeruiah's sister, Joab's mother.)

26 And Israel setted tents with Absalom in the land of Gilead.

27 And when David had come into the castles (And when David had come to Mahanaim), Shobi, the son of Nahash of Rabbah, of the sons of Ammon, and Machir, the son of Ammiel, of Lodebar, and Barzillai, of Gilead, of Rogelim,