This Abigail was David's sister and the mother of Amasa; she is distinct from Abigail, David's wife and the widow of Nabal.
Biography
Biblical genealogies identify Abigail as a sister of David and Zeruiah. She was the mother of Amasa, who later commanded Absalom's army during the rebellion against David and was subsequently appointed by David over his own army before being killed by Joab. The wording concerning Amasa's father varies in biblical references, but Abigail's relationship to David and Amasa is clear. Scripture gives no independent narrative of her life.
Biblical Significance
This Abigail is important for understanding David's extended family and Amasa's relationship to the king. She should be clearly distinguished and crosslinked separately from Abigail wife of Nabal.