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.
When trees did bud, and fields were green,
And broom bloom'd fair to see;
When Mary was complete fifteen,
And love laugh'd in her e'e;
Blythe Davie's blinks her heart did move
To speak her mind thus free;
Gang down the burn, Davie, love,
And I will follow thee.
Now Davie did each lad surpass
That dwelt on this burnside;
And Mary was the bonniest lass,
Just meet to be a bride:
Her cheeks were rosie, red and white;
Her een were bonnie blue;
Her looks were like the morning bright,
Her lips like dropping dew.
As down the burn they took their way,
And through the flow'ry dale;
His cheek to hers he aft did lay,
And love was aye the tale.
With, Mary, when shall we return,
Sic pleasure to renew?
Quoth Mary, Love, I like the burn,
And aye will follow you.