1 Samuel 17:33-35

Saul answered, “You can’t go out against this Philistine and fight him. You’re only a boy. Goliath has been a warrior since he was a young man.” But David said to Saul, “I, your servant, have been keeping my father’s sheep. When a lion or bear came and took a sheep from the flock, I would chase it. I would attack it and save the sheep from its mouth. When it attacked me, I caught it by its fur and hit it and killed it.