Biblical Context:
The account of David mourning Abner is found in 2 Samuel 3:31-39. This event occurs during a tumultuous period in Israel's history, marked by the transition of power from the house of Saul to David. Abner, the son of Ner, was the commander of Saul's army and a significant figure in the northern tribes of Israel. After Saul's death, Abner initially supported Ish-bosheth, Saul's son, as king over Israel. However, due to a falling out with Ish-bosheth, Abner sought to bring all Israel under David's rule, recognizing David as the divinely appointed king.

The Death of Abner:
Abner's death was a result of treachery. Joab, the commander of David's army, killed Abner in Hebron, seeking revenge for the death of his brother Asahel, whom Abner had killed in battle (2 Samuel 2:23). Joab's act was not sanctioned by David, and it threatened to undermine David's efforts to unify the kingdom.

David's Response:
David's reaction to Abner's death is one of genuine mourning and political astuteness. In 2 Samuel 3:31-32, David commands Joab and all the people with him to tear their clothes, put on sackcloth, and mourn for Abner. David himself follows the bier, demonstrating his respect and sorrow. The Berean Standard Bible records David's lamentation: "Should Abner die the death of a fool? Your hands were not bound, your feet were not fettered; as a man falls before the wicked, so you fell" (2 Samuel 3:33-34). This lament underscores the injustice of Abner's death and David's disapproval of the manner in which it occurred.

Significance of David's Mourning:
David's public mourning for Abner serves multiple purposes. It distances him from the murder, showing that he had no part in the treachery. This act of mourning helps to maintain his integrity and honor among the tribes of Israel, particularly those who had been loyal to Saul. David's lamentation and fasting until evening (2 Samuel 3:35) further emphasize his sincerity and respect for Abner, reinforcing his image as a just and righteous leader.

Political Implications:
David's actions following Abner's death are politically astute. By publicly mourning Abner, David seeks to win the favor of the northern tribes and demonstrate his commitment to justice and unity. In 2 Samuel 3:36-37, it is noted that all the people and all Israel understood that David had no part in Abner's murder, which helped to solidify his position as the rightful king over a united Israel.

David's Curse on Joab:
In 2 Samuel 3:29, David pronounces a curse on Joab and his family, expressing his anger and disapproval of Joab's actions. This curse serves to further distance David from the murder and to show his commitment to justice, even when it involves his own military commander.

David's Leadership:
David's handling of Abner's death highlights his qualities as a leader who values justice, unity, and the will of God. His ability to navigate the complex political landscape of Israel during this time is indicative of his wisdom and reliance on God's guidance. David's mourning for Abner is a testament to his character and his dedication to establishing a kingdom founded on righteousness and peace.