This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
As down the burn they took their way,
And thro' the flowery dale;
His cheek to hers he aft did lay,
And love was ay the tale.
With 'Mary, when we shall return,
Sic pleasure to renew?'
Quoth Mary, 'Love, I like the burn,
And ay shall follow you.'