1 Samuel 26, David on the run again, opened with a prayer for a clear signal in a world full of static.
1 Samuel 17 and the stone that sank into Goliath's forehead: David triumphs with a sling and no sword in his hand.
1 Samuel 17:45-47. David answers sword, spear and javelin with the name of the Lord, and states plainly that the battle is not his.
Samuel at Mizpah: put away the foreign gods, direct your heart to the Lord and serve him only — and Israel does, on the day the Philistines come up.
The second half: Israel trusted spiritual activity over spiritual obedience, and God's stuff over God's presence — a great deal of religion with nothing behind it.
Ecclesiastes 4 and spiritual warfare, asking which tools you are actually fighting with — weapons of the flesh, or the ones given for demolishing strongholds.