1 Samuel 17:34-37

34But David said to Saul, "Your servant used to keep sheep for his father. And when there came a lion, or a bear, and took a lamb from the flock,

35I went after him and struck him and delivered it out of his mouth. And if he arose against me, I caught him by his beard and struck him and killed him.

36Your servant has struck down both lions and bears, and this uncircumcised Philistine shall be like one of them, for he has defied the armies of the living God."

37And David said, "The Lord who delivered me from the paw of the lion and from the paw of the bear will deliver me from the hand of this Philistine." And Saul said to David, "Go, and the Lord be with you!"