David Facing His Goliath by Dr Michael H Yeager

ENEMY DEFEATED BY DAVID BECAUSE OF COVENANT
David had a Heart of God! His Heart was circumcised!

1 Samuel 17:26And David spake to the men that stood by him, saying, What shall be done to the man that killeth this Philistine, and taketh away the reproach from Israel? for who is this uncircumcised Philistine, that he should defy the armies of the living God?

1 Samuel 17:36Thy servant slew both the lion and the bear: and this uncircumcised Philistine shall be as one of them, seeing he hath defied the armies of the living God.