1 Samuel 14:24, 28

Now the Israelites were in distress that day, because Saul had bound the people under an oath, saying, “Cursed be anyone who eats food before evening comes, before I have avenged myself on my enemies!” So none of the troops tasted food.

Then one of the soldiers told him, “Your father bound the army under a strict oath, saying, ‘Cursed be anyone who eats food today!’ That is why the men are faint.”