This text comes from The Canadian Soldiers' Song Book, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
There's a light that's burning in the window
Of a little house upon the hill,
And the light will burn, and a heart will yearn,
And it always will till I return.
For there's only one mother,
I know she's waiting still,
And she'll always keep the light a-burning
In the window of the house upon the hill.