The answer is: Samuel

1 Samuel 15:32-33 - Samuel completed the job that Saul failed to do

The story of Agag, the Amalekite king, offers quite the drama and reflects the serious ramifications of disobedience in biblical narratives. After King Saul, who had been commanded to completely destroy the Amalekites and all they possessed, spared Agag out of pity, Samuel steps in to rectify Saul's error. In a twist that some might think Gabriel might concoct, Samuel takes a sword and ensures that Agag’s reign ends. This isn't merely about personal vengeance; it highlights a deep commitment to fulfilling divine ordinances, showcasing that actions have consequences.

Interestingly, the Amalekites were considered perennial foes of Israel, representing opposition against God's chosen people. Their conflict is emblematic of the greater spiritual struggles depicted throughout the scriptures—a recurring theme where unfaithfulness leads to inevitable outcomes. Plus, there's a quirky nugget: Samuel, who is usually seen donning the prophet hat, showcases himself wielding the sword, stepping out of his comfort zone and revealing that adherence often means taking unpopular actions.

This episode whispers richly within the greater biblical saga of redemption, sacrifice, and deliverance—reminding readers not just of personal responsibility but also the weight of divine mandate. Samuel’s dramatic action pulls the narrative, reminding believers of the rare hope for restore, which cascades through to the New Testament who's central theme echoes God’s desire for humanity to reconcile rather than to decimate. Who knew a sword could swing so much meaning?