This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Chorus
Fairest maid on Devon banks,
Crystal Devon, winding Devon,
Wilt thou lay that frown aside,
And smile as thou were wont to do?
Full well thou know'st I love thee dear,
Couldst thou to malice lend an ear?
O, did not love exclaim, "Forbear,
Nor use a faithful lover so?"
Fairest maid, &c.
Then come, thou fairest of the fair,
Those wonted smiles, O, let me share;
And by thy beauteous self I swear,
No love but thine my heart shall know.
Fairest maid, &c.