2 Samuel 3:2-6

Sons were born to David in Hebron: his firstborn was Amnon, by Ahinoam the Jezreelitess;

and his second, Chileab, by Abigail the widow of Nabal the Carmelite; and the third, Absalom the son of Maacah, the daughter of Talmai, king of Geshur;

and the fourth, Adonijah the son of Haggith; and the fifth, Shephatiah the son of Abital;

and the sixth, Ithream, by David’s wife Eglah. These sons were born to David in Hebron. Abner Joins David

Now it happened that while there was war between the house of Saul and the house of David, Abner was strengthening himself in the house of Saul.