Great Comet Melody Question

I've recently been looking at the genius.com lyrics annotations for Great Comet, and one loose thread has made me quite perplexed. In "The Abduction" the maidservant's lines ("Come in through the courtyard, or you'll be seen/She'll come out directly) had been retooled to sound much more operatic than they did on the OOBCR. According to Dave Malloy's annotations (link: https://genius.com/Dave-malloy-the-abduction-lyrics), the melody there is very familiar, but I can't for the life of me figure out what it's supposed to be! Any light that could be shed on this subject is greatly appreciated. Thanks!