With respect Steve - it is a "floater" verse which automatically 'belongs' to every song or ballad it lands on
These are transferable motifs like 'seas running dry" or "rocks melting with the sun"
At present I'm being gobsmacked by working may way though a survey of songs which make up the 1801 second edition introduction to 'Complaynt of Scotland' and finding out how far back these motifs and even songs go
Putting dates or specific origins on them is like trying to put fog in a bottle
Jim