This text comes from The Canadian Soldiers' Song Book, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Come back to Erin, Mavourneen, Mavourneen,
Come back, Aroon, to the land of thy birth,
Come with the shamrocks and spring-time Mavourneen,
And it's Killarney shall ring with our mirth.
Sure, when we lent ye to beautiful England,
Little we thought of the lone winter days,
Little we thought of the hush of the starshine
Over the mountain, the Bluffs and the Brays!
Then come back to Erin, Mavourneen, Mavourneen,
Come back again to the land of thy birth
Come back to Erin, Mavourneen, Mavourneen,
And it's Killarney shall ring with our mirth.