when Gehazi, the servant of Elisha the man of God, said to himself, “Just look how my master has let this Naaman the Syrian off the hook by not accepting the gifts he brought! As the Lord lives, I'll run after him and get something from him.”
Saul and his army spared Agag, together with the best sheep and cattle, the fat calves and lambs, and everything else that was any good. They didn't want to destroy those, but they completely destroyed all that was unwanted and worthless.