I took this from
A detailed map and guide to reading assignments.
The Malebolge (Evil Ditches and/or Pouches full of Evil)
Bolgia Three: The Simoniacs. (Those were clerics who sold the favors of the Church; for example, they might have sold the right to divorce, which was normally
forbidden, or they might have taken money for allegedly influencing God to get you into heaven more quickly after death.) Punishment: They're placed headfirst
in stone monuments which are, in effect, inverted baptismal fonts. Only their feet show, and these are scorched by burning oil like the holy oil used in
sacraments. Each time their bisop or papal seats are assumed after their deaths by someone else who took money for the Church's favors, the new sinner
drops into their slot and they disappear forever inside the rock of the monuments.
READ: Canto 19, lines 13-78, pages 1024-6.
Obviously, it means absolutely nothing, just how my disturbing mind works sometimes, always wanting to figure out where stuff comes from.