What does 1 Samuel 14:36 mean?

Saul said, 'Let’s go after the Philistines tonight and take everything they have until morning. We won’t leave any of them alive.' The people answered, 'Do whatever you think is best.' But the priest said, 'Let’s ask God first.' 1 Samuel 14:36 - Modern Text Bible

(Saul wants to press the advantage, but the priest reminds him to seek God’s guidance before acting.)