Bede

But David said to Ahimelech, "If you have a spear or a sword here at hand, etc." The Savior urges the apostles to train their listeners not only to learn but also to teach the word of life, by which He Himself can conquer the world, because He delayed sending preachers of the Gospel throughout the world, who would always fight for the Church against the aerial powers, instead of the angelic virtues through which the law was ordained in the hand of the Mediator. …

Commentary on Samuel ↗