The answer is: Sling and stone

1 Sam 17:49-50 - "So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine and killed him." David killed Goliath with the stone and then "visibly" killed him so the crowd could see he was dead by cutting of his head with Goliath's sword.

David's epic showdown with Goliath is amongst the most famous stories in the Bible, stretching its limbs beyond sacred texts into countless cultural references. The arduous underdog theme resonates across generations. David, just a shepherd boy, faced the mighty warrior armed with nothing but a sling and a few smooth stones. This choice of weapons is fascinating: a sling, while seemingly unassuming, was a sophisticated tool of warfare in ancient times, capable of hurling stones with staggering force.

Have you ever tried to wield a slingshot? The mechanics of a sling require practice and skill, which is perhaps why skilled slingers were feared in battles – they could strike accurately from distances that would give any rival a fright. David’s sling was a weapon of the smart and savvy, conjoining sheer talent with audacity!

Interestingly, it’s good to note David didn’t simply slay Goliath; he also signified his triumph by wielding the giant's own sword. This act was a powerful statement: not only had he defeated Goliath, he had usurped the enemy's strength, a motif echoed in many cultures; for instance, battles won are often seen through a lens of symbolic triumph over darkness or evil.

Feel free to ponder how the famed story has transcended mere history, inspiring countless tales about confronting seemingly insurmountable challenges, illustrating that even the meek can overcome the powerful. The legacy of David and Goliath highlights wisdom that is as relevant today as it was then—a true testament of faith, courage, and the spirit of resilience!