1 Chronicles 2:16

Now these are the names of the sons of Israel—of Jacob and his sons—who were coming to Egypt: Reuben, Jacob’s firstborn.

Then David answered and said to Ahimelech the Hittite and to Abishai the son of Zeruiah, Joab’s brother, saying, “Who will go down with me to Saul in the camp?” And Abishai said, “I will go down with you.”

And Joab the son of Zeruiah and the servants of David went out and met them by the pool of Gibeon; and they sat down, one on the one side of the pool and the other on the other side of the pool.

Now the three sons of Zeruiah were there, Joab and Abishai and Asahel; and Asahel was as swift-footed as one of the gazelles which is in the field.

And Absalom set Amasa over the army in place 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 of Zeruiah, Joab’s mother.