1 Samuel 14:6

Then Yahweh said to Gideon, “The people are still too many; bring them down to the water, and I will test them for you there. And it will be that he of whom I say to you, ‘This one shall go with you,’ he shall go with you; but everyone of whom I say to you, ‘This one shall not go with you,’ he shall not go.”

And Yahweh said to Gideon, “I will save you with the 300 men who lapped and will give the Midianites into your hands; so let all the other people go, each man to his place.”

Then David spoke to the men who were standing by him, saying, “What will be done for the man who strikes down this Philistine and takes away the reproach from Israel? For who is this uncircumcised Philistine, that he should reproach the battle lines of the living God?”

and that all this assembly may know that Yahweh does not save by sword or by spear; for the battle is Yahweh’s, and He will give you into our hands.”

Then Saul said to his armor bearer, “Draw your sword and pierce me through with it, lest these uncircumcised come and pierce me through and abuse me.” But his armor bearer was not willing, for he was greatly afraid. So Saul took his sword and fell on it.

“Tell it not in Gath, Proclaim it not in the streets of Ashkelon, Lest the daughters of the Philistines be glad, Lest the daughters of the uncircumcised exult.