The answer is: The head of Goliath

1 Sam 17:57 - The proof of the deed.

After the epic showdown between David and Goliath, it’s quite a scene that unfolds when David is brought before King Saul. Picture this young shepherd boy with the head of a legendary giant in hand—a literal trophy of courage and faith! This moment wasn’t just about one victory; it symbolized how unexpected greatness often comes through those who are looked down upon.

Now, hold onto your hats, because when David walks in swinging Goliath's severed head, he’s not just showcasing triumph; he’s cementing his reputation. Think about it: everyone doubted him because he was just a youth, yet he armed himself with little more than a simple sling and his deep trust in a higher purpose.

This story resonates even beyond ancient Israel; the motif of the underdog rising against great odds is a common theme seen across cultures. Ever heard of “David vs. Goliath” in contemporary parlance? It’s a timeless reference!

Moreover, this moment strengthens what we see later in David's life as he becomes a leader, exhibiting not only bravery but wisdom. It paints a broader stroke on the canvas of biblical history—the victory against Goliath foreshadowing not just David's kingship but also the ideals of humility, faith, and divine purpose that resonate throughout scriptures. Goliath's downfall reminds us that even the most formidable obstacles can be overcome with courage. How’s that for an inspiring lesson?