It’s quite interesting to notice that Eliab could get angry at David, but he didn’t get angry at the Philistine. But David was angry at the Philistine, and he wanted something done about it. King Saul got word that David was interested in offering up his services, so David was brought before him. Then David said to Saul, “Let no man’s heart fail because of him; your servant will go and fight with this Philistine.” (v. 32) Since Saul now had a volunteer, he was willing to take on the giant! Of course,