1 Samuel 25:9-11
9-11David's young men went and delivered his message word for word to Nabal. Nabal tore into them, "Who is this David? Who is this son of Jesse? The country is full of runaway servants these days. Do you think I'm going to take good bread and wine and meat freshly butchered for my sheepshearers and give it to men I've never laid eyes on? Who knows where they've come from?"
12-13David's men got out of there and went back and told David what he had said. David said, "Strap on your swords!" They all strapped on their swords, David and his men, and set out, four hundred of them. Two hundred stayed behind to guard the camp.