This text comes from The Canadian Soldiers' Song Book, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
The Minstrel Boy to the war is gone,
In the ranks of death you'll find him
His father's sword he has girded on,
And his wild harp slung behind him.
"Land of song!" said the warrior bard,
"Tho' all the world betrays thee,
One sword, at least, thy rights shall guard,
One faithful harp shall praise thee."