Bless me, Lord, that I might do
  Great things for You;
Against the evils that assail
  Make me prevail.

Against King Saul who sought to still
  The lyre and kill
The shepherd-soldier, David stayed
  His hand and blade.

The Chosen's life let no one take
  For justice' sake;
The flying spear You timely send—
  Saul met his end.

While foes remain, make enemies sleep,
  In slumber deep;
As You gave David victory,
  So do for me.

by J. Randal Matheny. Bible reference: 1 Samuel 26, especially verse 25.