David said to Ahimelech the priest, The king has commanded me a business, and has said to me, Let no man know anything of the business about which I send you, and what I have commanded you: and I have appointed the young men to such and such a place.
So David's saying, "I'm a CIA agent, I'm on a special mission for the king, and nobody knows about this special mission. It's just a secret mission that I'm on for King Saul. So my men are over here, and I need some bread for them.