random lyric question

Anybody know where I heard the line, "come all you pretty fair maids, a warning take by me," before I got to track two on this Stan Rogers CD? I'd never heard the rest of the song before, and it's driving me just a little bit nuts.

ETA: Okay, what I meant to say was, I'd seen something - TV or movie or such - where a character sang just that one line, and I never quite knew what was being alluded to. Does that ring bells with anyone else?