ABIGAIL, 2. Sister of David, and mother of Amasa
Absalom set Amasa over the army instead of Joab. Now Amasa was the son of a man whose name was Ithra the Israelite, who went in to ABIGAIL the daughter of Nahash, sister to Zeruiah, Joab's mother.
16. and their sisters were Zeruiah and ABIGAIL. The sons of Zeruiah: Abishai, Joab, and Asahel, three.