1 Chronicles 11:6
Now David said, “Whoever strikes down a Jebusite first shall be chief and commander.” Joab the son of Zeruiah [David’s half sister] went up first, and so he was made chief.
2 Samuel 8:16
Joab the son of Zeruiah was [commander] over the army; Jehoshaphat the son of Ahilud was recorder (secretary);
Joshua 15:16-17
Caleb said, “I will give Achsah my daughter as wife to the man who attacks Kiriath-sepher and captures it.”
1 Samuel 17:25
The men of Israel said, “Have you seen this man who is coming up? Surely he is coming up to defy Israel. The king will reward the man who kills him with great riches, and will give him his daughter [in marriage] and make his father’s house (family) free [from taxes and service] in Israel.”
2 Samuel 2:18
Three sons of Zeruiah [the half sister of David] were there: Joab, Abishai, and Asahel. Now Asahel was as light and swift-footed as one of the [wild] gazelles in the field.
2 Samuel 3:27
So when Abner returned to Hebron, Joab took him aside to the middle of the gate to speak to him privately, and there he struck Abner in the abdomen so that he died,
2 Samuel 20:23
Now Joab was [commander] over the entire army of Israel; Benaiah the son of Jehoiada was [commander] over the Cherethites and Pelethites [the king’s bodyguards];