Jamieson, Fausset and Brown on 1 Samuel 14:24

24. Saul had adjured the people--Afraid lest so precious an opportunity of effectually humbling the Philistine power might be lost, the impetuous king laid an anathema on any one who should taste food until the evening. This rash and foolish denunciation distressed the people, by preventing them taking such refreshments as they might get on the march, and materially hindered the successful attainment of his own patriotic object.