this:
Isaiah 1:18 (King James Authorised Version)
'Though your sins be as scarlet,
they shall be as white as snow;
though they be red like crimson,
they shall be as wool.'
Obvious connection to the line 'Though your fins be scarlet'.
The scarlet in question is related to prostitution, presumably another
pun on sister of mercy.
The above Biblical quote also forms the chorus of Original Trinity Hymnal # 465:
http://www.cyberhymnal.org/htm/t/h/thoyours.htm
Funky stuff!
