1 Samuel 17:34-36

And David said to Saul, Your servant kept his father's sheep. And when there came a lion or again a bear and took a lamb out of the flock, I went out after it and smote it and delivered the lamb out of its mouth; and when it arose against me, I caught it by its beard and smote it and killed it. Your servant killed both the lion and the bear; and this uncircumcised Philistine shall be like one of them, for he has defied the armies of the living God!