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. For the word of the king was pressing, that is, the enormity of human depravity, which preferred to reign by neglecting God, compelled that not angels, whose spiritual glory they could not see due to habitual carnal life, but mortal men alike to them should be sent to instruct them, who would proclaim to them to turn from vanity to the living God; who, if they had never sinned, would now rejoice in the familiar fellowship of angelic light. — Commentary on Samuel