This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Powers celestial, whose protection
Ever guards the virtuous fair,
While in distant climes I wander,
Let my Mary be your care:
Let her form sae fair and faultless,
Fair and faultless as your own;
Let my Mary's kindred spirit
Draw your choicest influence down.
Make the gales you waft around her
Soft and peaceful as her breast;
Breathing in the breeze that fans her,
Soothe her bosom into rest:
Guardian angels, O protect her,
When in distant lands I roam;
To realms unknown while fate exiles me,
Make her bosom still my home.