You shall know ... - David dissembled (compare also 1 Samuel 29:8), hoping, no doubt, that something would happen to prevent his…

And David said to Achish. —Sorely perplexed, David temporizes. He dares not refuse; and yet, the idea of commanding a Philistine d…

And David said to Achish, surely you shall know what your
servant can do
By which he …

David could not refuse Achish without danger. If he promised assistance, and then stood neutral, or went over to the Israelites, he would behave wi…