Amasa.

2 Samuel 17:25
Absalom had appointed Amasa over the army in place of Joab. Amasa was the son of a man named Ithra, the Ishmaelite who had married Abigail daughter of Nahash and sister of Zeruiah the mother of Joab.

2 Samuel 19:13
And say to Amasa, 'Aren't you my flesh and blood? May God punish me, and ever so severely, if from this time you are not the commander of my army in place of Joab!'"

2 Samuel 20:4-12
Then the king said to Amasa, "Summon the men of Judah to come to me within three days, and be here yourself." . . .

1 Kings 2:5, 32
Moreover, you know what Joab son of Zeruiah did to me and what he did to Abner son of Ner and Amasa son of Jether, the two commanders of the armies of Israel. He killed them in peacetime to avenge the blood of war. He stained with the blood of war the belt around his waist and the sandals on his feet. . . .

Jether.

2 Samuel 17:25
Absalom had appointed Amasa over the army in place of Joab. Amasa was the son of a man named Ithra, the Ishmaelite who had married Abigail daughter of Nahash and sister of Zeruiah the mother of Joab.

Ithra an Israelite.

Ishmeelite.