When Saul had watched David going out to fight the Philistine, he'd asked Abner the army commander, “Abner, whose son is that young man?” “On your life, Your Majesty, I do not know,” Abner replied.
As soon as David returned from killing the Philistine, Abner took him and brought him before Saul. David was still clutching the Philistine's head in his hand.
The priest replied, “The sword of Goliath the Philistine is here—the one you killed in the Valley of Elah. It's wrapped in a cloth behind the ephod. You can take it if you want. It's the only one here.” “It's better than any other sword! Please give it to me,” David replied.