2 Samuel 17:24-26

24David had reached Mahanaim by the time Absalom crossed the Jordan, he and all the men of Israel with him.

25Now Absalom had set Amasa over the army instead of Joab. (Now Amasa was son of a man whose name was Ithra the Israelite, who had gone to Abigal daughter of Nahash, sister to Zeruiah Joab’s mother.)

26Israel and Absalom camped in the land of Gilead.