1 Samuel 17:51
Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith. And when the Philistines saw their champion was dead, they fled.
Cross-reference
1 Samuel 17:46
Prophetic fulfillment
In 1 Samuel 17:46, David predicted he would cut off Goliath's head, which he fulfills here.
1 Samuel 21:9
Historical context
In 1 Samuel 21:9, David asks for Goliath's sword, the same sword he used to behead him here.
Hebrews 11:34
Parallel
Hebrews 11:34 lists faith heroes who 'routed foreign armies' — David's defeat of Goliath exemplifies this faith-driven victory.
1 Chronicles 11:23
Parallel
1 Chronicles 11:23 records Benaiah killing an Egyptian giant with his own spear — a similar feat of using the enemy's weapon.
Esther 7:9
Parallel
Esther 7:9 has Haman hanged on his own gallows — like David using Goliath's sword, poetic justice where the wicked are caught by their own device.