1 Samuel 17:32-36

32And David said to Saul, Let no man's heart fail because of him: thy servant will go and fight with this Philistine.

33And Saul said to David, Thou art not able to go against this Philistine to fight with him; for thou art but a youth, and he a man of war from his youth.

34And David said to Saul, Thy servant fed his father's sheep, and there came a lion, and also a bear, and took a lamb out of the flock.

35And I went after him, and smote him, and delivered it out of his mouth; and when he arose against me, I seized him by his beard, and smote him, and slew him.

36Thy servant smote both the lion and the bear; and this uncircumcised Philistine shall be as one of them, because he has defied the armies of the living 1God.