Passage
For Israel had put themselves in array, and the Philistines who stood against them were prepared.
For Israel had put themselves in array, and the Philistines who stood against them were prepared.
1 Samuel 17:19 But Saul, and they, and all the children of Israel, were in the valley of Terebinth, fighting against the Philistines.
1 Samuel 17:20 David, therefore, arose in the morning, and gave the charge of the flock to the keeper: and went away loaded, as Isai had commanded him. And he came to the place of Magala, and to the army, which was going out to fight, and shouted for the battle.
1 Samuel 17:21 For Israel had put themselves in array, and the Philistines who stood against them were prepared.
1 Samuel 17:22 And David leaving the vessels which he had brought, under the care of the keeper of the baggage, ran to the place of the battle, and asked if all things went well with his brethren.
1 Samuel 17:23 And as he talked with them, that baseborn man, whose name was Goliath, the Philistine, of Geth, shewed himself coming up from the camp of the Philistines: and he spoke according to the same words, and David heard them,
The verse centers on "israel", "themselves", "array", "philistines", "stood", "against", and "prepared". It is saying that the verse draws attention to "israel" and "themselves", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 20's "David therefore arose in the morning and..." into verse 22's "And David leaving the vessels which he...", so "israel" and "themselves" belong inside that flow. In 1 Samuel context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "israel" and "themselves" with trust shaped by these words, not by a vague optimism outside the passage.