Passage
Now Saul, and they, and all the men of Israel, were in the vale of Elah, fighting with the Philistines.
Now Saul, and they, and all the men of Israel, were in the vale of Elah, fighting with the Philistines.
1 Samuel 17:17 And Jesse said unto David his son, Take now for thy brethren an ephah of this parched grain, and these ten loaves, and carry [them] quickly to the camp to thy brethren;
1 Samuel 17:18 and bring these ten cheeses unto the captain of their thousand, and look how thy brethren fare, and take their pledge.
1 Samuel 17:19 Now Saul, and they, and all the men of Israel, were in the vale of Elah, fighting with the Philistines.
1 Samuel 17:20 dummy verses inserted by amos
1 Samuel 17:21 And Israel and the Philistines put the battle in array, army against army.
The verse centers on "saul", "israel", "vale", "elah", "fighting", and "philistines". It is saying that the verse draws attention to "saul" and "israel", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 18's "and bring these ten cheeses unto the..." into verse 20's "dummy verses inserted by amos...", so "saul" and "israel" 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 "saul" and "israel" with trust shaped by these words, not by a vague optimism outside the passage.