1 Chronicles 2:13-17

and Jesse begat his first-born Eliab, and Abinadab the second, and Shimea the third, Nethanel the fourth, Raddai the fifth, Ozem the sixth, David the seventh; and their sisters were Zeruiah and Abigail. And the sons of Zeruiah: Abishai, and Joab, and Asahel, three. And Abigail bare Amasa; and the father of Amasa was Jether the Ishmaelite.