The answer is: Three

2 Sam 18:14 - David had instructed that Absalom not be hurt, but Joab ignored David's wishes.

The story of Absalom's demise is a poignant lesson in the complexities of familial loyalty and the tragedy of rebellion. David, Absalom's father, lamented his son despite the threat he posed, urging his commanders to spare the young man. It adds a heartrending angle to the tale that Absalom's ambitious rise and his eventual fall were rooted in family dynamics—much like many of us face today.

Joab's decisive act of thrusting three rods through Absalom's heart showcases not just ruthless practicality but also a violation of David's direct command. It's striking how the number three often holds significant meaning throughout the Bible; just as Peter denied Jesus three times, Absalom's fate encapsulates themes of betrayal and misunderstanding amidst the weight of familial bonds.

Interestingly, the imagery of Absalom hanging by the tree parallels several other scripture scenes, such as the hanging of Judas. Both situations invoke thoughts of shame and consequence, emphasizing the fateful grip of personal actions. To add a bit of trivia: just as trees often symbolize life in scripture, here they note death, demonstrating a twist in biblical imagery.

Joab's actions, although harsh, speak to the devastating consequences of civil strife and ambition. Absalom’s flamboyant hair—his downfall hanging him up—distils this entirety; vanity turned into vulnerability serves as enduring wisdom as pertinent today as during David’s reign.