2 Samuel 17:20-28
English Standard Version
21After they had gone, the men came up out of the well, and went and told King David. They said to David, "Arise, and go quickly over the water, for thus and so has Ahithophel counseled against you."
22Then David arose, and all the people who were with him, and they crossed the Jordan. By daybreak not one was left who had not crossed the Jordan.
24Then David came to Mahanaim. And Absalom crossed the Jordan with all the men of Israel.
25Now Absalom had set Amasa over the army instead of Joab. Amasa was the son of a man named Ithra the Ishmaelite, who had married Abigal the daughter of Nahash, sister of Zeruiah, Joab 's mother.
26And Israel and Absalom encamped in the land of Gilead.