2 Samuel 17:25-26

25Joab had been the leader of Israel's army. But now Absalom had chosen Amasa as leader instead of Joab. Amasa's father, Jether, was a descendant of Ishmael. He had married Abigail. She was Nahash's daughter and a sister of Zeruiah, Joab's mother.

26Absalom and Israel's army made their camp in Gilead region.