burnt offering vs widow's mite

burnt offering

noun
  • Any sacrifice to a deity or deities, or to the deceased in such a way. 

  • Overcooked food. 

  • A slaughtered animal offered and burnt on an altar, as an atonement for sin. 

widow's mite

noun
  • A very small gift or donation which, however, represents a great sacrifice on the part of the giver. 

  • The lepton coin. 

How often have the words burnt offering and widow's mite occurred in a corpus of books? (source: Google Ngram Viewer )