Fight the Lord's battles - Mr. Calmet properly remarks that the wars of the Hebrews, while conducted by the express orders of God, were truly the wars of the Lord; but when the spirit of worldly ambition and domination became mingled with them, they were no longer the wars of the Lord, but wars of lust and profanity.
Saul had not hitherto fulfilled the promise of which David had heard (marginal reference); nor was it unnatural that Saul should delay to do so, until the shepherd‘s boy had risen to a higher rank.