David said to Saul, ‘Let no-one lose heart on his account; your servant will go and fight the Philistine.’ But Saul answered David, ‘You cannot go and fight the Philistine; you are only a boy and he has been a warrior from his youth.’

‘The Lord who rescued me from the claws of lion and bear’ David said ‘will rescue me from the power of this Philistine.’ Then Saul said to David, ‘Go, and the Lord be with you!’

He took his staff in his hand, picked five smooth stones from the river bed, put them in his shepherd’s bag, in his pouch, and with his sling in his hand he went to meet the Philistine. The Philistine, his shield-bearer in front of him, came nearer and nearer to David; and the Philistine looked at David, and what he saw filled him with scorn, because David was only a youth, a boy of fresh complexion and pleasant bearing. The Philistine said to him, ‘Am I a dog for you to come against me with sticks?’ And the Philistine cursed David by his gods. The Philistine said to David, ‘Come over here and I will give your flesh to the birds of the air and the beasts of the field.’ But David answered the Philistine, ‘You come against me with sword and spear and javelin, but I come against you in the name of the Lord of Hosts, the God of the armies of Israel that you have dared to insult. Today the Lord will deliver you into my hand and I shall kill you; I will cut off your head, and this very day I will give your dead body and the bodies of the Philistine army to the birds of the air and the wild beasts of the earth, so that all the earth may know that there is a God in Israel, and that all this assembly may know that it is not by sword or by spear that the Lord gives the victory, for the Lord is lord of the battle and he will deliver you into our power.’

No sooner had the Philistine started forward to confront David than David left the line of battle and ran to meet the Philistine. Putting his hand in his bag, he took out a stone and slung it and struck the Philistine on the forehead; the stone penetrated his forehead and he fell on his face to the ground. Thus David triumphed over the Philistine with a sling and a stone and struck the Philistine down and killed him. David had no sword in his hand. Then David ran and, standing over the Philistine, seized his sword and drew it from the scabbard, and with this he killed him, cutting off his head. The Philistines saw that their champion was dead, and took to flight.

Blessed be the Lord, my rock.

Blessed be the Lord, my rock,
  who trains my arms for battle,
  who prepares my hands for war.

Blessed be the Lord, my rock.

He is my love, my fortress;
  he is my stronghold, my saviour
my shield, my place of refuge.
  He brings peoples under my rule.

Blessed be the Lord, my rock.

To you, O God, will I sing a new song;
  I will play on the ten-stringed lute
to you who give kings their victory,
  who set David your servant free.

Blessed be the Lord, my rock.

Alleluia, alleluia!
The word of God is something alive and active:
it can judge secret emotions and thoughts.
Alleluia!