Biblical Context:
Joab, the son of Zeruiah, was a prominent military commander under King David, known for his strategic acumen and sometimes ruthless methods. His relationship with David was complex, marked by loyalty, tension, and occasional defiance. The event of Joab reporting to David is a significant moment in the narrative of David's reign, illustrating the dynamics of power, authority, and the consequences of military actions.

Scriptural Account:
The account of Joab reporting to David is primarily found in 2 Samuel 12:26-31. This passage details the conclusion of the siege of Rabbah, the Ammonite capital. Joab, having captured the city's water supply, sends messengers to David, urging him to come and claim the final victory to ensure the city is named after David rather than Joab.

2 Samuel 12:26-28 :
"Meanwhile, Joab fought against Rabbah of the Ammonites and captured the royal fortress. Then Joab sent messengers to David to say, 'I have fought against Rabbah and have captured the water supply of the city. Now, therefore, assemble the rest of the troops, besiege the city, and capture it. Otherwise, I will take the city myself, and it will be named after me.'"

Analysis:
Joab's report to David is a strategic move, both militarily and politically. By capturing the water supply, Joab effectively secured the city's surrender, but he deferred the final conquest to David. This act demonstrates Joab's recognition of David's ultimate authority as king and his desire to honor David by allowing him to claim the victory. It also reflects Joab's understanding of the importance of maintaining the king's prestige and the unity of the nation under David's leadership.

Character of Joab:
Joab's actions in this episode reveal his complex character. He is a capable and decisive leader, willing to take bold actions to achieve military objectives. However, his decision to involve David in the final capture of Rabbah shows a level of political savvy and respect for the monarchy. Joab's relationship with David is marked by loyalty, yet he is not above challenging the king when he believes it necessary, as seen in other parts of the biblical narrative.

David's Response:
David's response to Joab's report is not detailed in the immediate passage, but it is implied that he heeds Joab's advice. David gathers the troops, leads them to Rabbah, and captures the city. This action reinforces David's role as the leader of Israel and the one who ultimately secures the nation's victories.

Theological Implications:
The episode of Joab reporting to David underscores themes of leadership, authority, and the proper exercise of power. Joab's deference to David highlights the biblical principle of respecting God-ordained authority. It also serves as a reminder of the importance of unity and cooperation among leaders for the greater good of God's people.

Historical and Cultural Context:
The siege of Rabbah and the subsequent report to David occur during a period of expansion and consolidation for the Israelite kingdom. The capture of Ammonite territory represents a significant strategic and economic gain for Israel. Joab's actions and his report to David reflect the military practices and political considerations of the ancient Near Eastern context, where the naming of a city after its conqueror was a common practice to signify dominance and legacy.

Conclusion:
The account of Joab reporting to David is a multifaceted narrative that provides insight into the leadership dynamics of ancient Israel. It highlights Joab's role as a military leader and his relationship with King David, while also illustrating broader themes of authority, loyalty, and the responsibilities of leadership in accordance with God's purposes.