abdest vs purgation

abdest

noun
  • The Islamic act of washing parts of the body using water for ritual prayers and for handling and reading the Qur'an. 

purgation

noun
  • The process or act of cleansing from sin or guilt. 

  • The process or act of purging, such as by the use of a purgative. 

How often have the words abdest and purgation occurred in a corpus of books? (source: Google Ngram Viewer )