Well, I got it from Fuchsia Pickett's book, “Stones of Rememberance” (pg. 75).

She was seeing Goliath representing satan. David picked up five smooth stones to throw at him.  But he only used one stone.

The Lord was showing her that he came in the "name" of the Lord.  He was showing that you can throw the name of the Lord at satan.

The other four things were:

The "word" of the Lord - like Jesus did when He was tempted by satan.

The "blood" of the Lord - often claimed in deliverance.

The "Spirit" of the Lord - His Spirit can cleanse temples and drive away evil.

The "faith" of the Lord - His faithfulness is a rock that we can use against satan.