He left his weapons behind him, that he might with less suspicion remove from place to place, and hide himself from Saul and his spies. The king's business required haste; the message came to me when I was unarmed, and the business required so great expedition that I could not go home to fetch my weapons.
Related Commentaries of 1 Samuel 21:8
1 Samuel 21:8
8 And David said unto Ahimelech, And is there not here under thine hand spear or sword? for I have neither brought my sword nor my weapons with me, because the king's business required haste.