Saul is accusing David of something, but he starts by reminding him of an incredible feat. What was it, and why does it matter so much?
The Giant Slayer's Courage
The verse kicks off with Saul's reminder of David's most famous act: defeating Goliath. "He took his life in his hand" is a powerful idiom, meaning David willingly risked everything, even his life, for Israel. This wasn't just a lucky shot; it was an act of profound faith and courage, directly enabled by God's power: "the LORD worked a great salvation for all Israel."
This event wasn't just a military victory; it was a divine intervention that secured safety and hope for the entire nation. Saul himself witnessed this miracle and, according to his own words here, rejoiced in it.