This text comes from The Book of Scottish Song, edited by Alexander Whitelaw, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Let us owre to Campsie Glen, bonnie lassie, O,
By the dingle that you ken, bonnie lassie, O,
To the tree where first we woo'd,
And cut our names so rude,
Deep in the sauch-tree's wood, bonnie lassie, O.
O'er the willow brig we'll wend, bonnie lassie, O,
And the ladders we'U ascend, bonnie Lissie, O,
Where the woodroof loves to hide
Its scented leaves, beside
The streamlets, as they glide, bonnie lassie, O.
Where the blue bell on the brae, bonnie lassie, O,
Where the sweetest scented slae, bonnie lassie, O,
And the flow'rets ever new,
Of nature's painting true,
All fragrant bloom for you, bonnie lassie, O.
Where the music of the wood, bonnie Lissie, O,
And the dashing of the flood, bonnie lassie, O,
O'er the rock and ravine mingle,
And glen and mountain dingle,
With the merry echoes tingle, bonnie lassie, O.
On the moss-seat we'll recline, bonnie lassie, O,
Wi' a hand in each of thine, bonnie lassie, O;
The bosom's warmest thrill
Beats truer, safter still,
As our hearts now glowing fill, bonnie lassie, O.
Then before bright heaven's eye, bonnie lassie, O,
We will double love-knots tie, bonnie lassie, O;
Then true affection plighted.
We'll love and live united,
With hearts and hands united, bonnie lassie, O.