1 Samuel 17:33-35

“Don’t be ridiculous!” Saul replied. “There’s no way you can fight this Philistine and possibly win! You’re only a boy, and he’s been a man of war since his youth.” But David persisted. “I have been taking care of my father’s sheep and goats,” he said. “When a lion or a bear comes to steal a lamb from the flock, I go after it with a club and rescue the lamb from its mouth. If the animal turns on me, I catch it by the jaw and club it to death.