Why is the title Absalom, Absalom?

Before entering into an analysis of the first chapter of this book, it is helpful to begin with the title. "Absalom, Absalom!" is the lamenting cry of King David in the second book of Samuel (18:33), upon hearing of the assassination of his beloved son. It is useful to read the story of Absalom in the second book of Samuel--a dramatic story of dynasties, rebellion, incest, and death--as it is a direct influence on Faulkner's own tale, contains many of the same events, and is, on a first reading, infinitely easier to understand!