peace offering vs widow's mite

peace offering

noun
  • A religious sacrifice. 

  • An offering or concession made to an adversary in the hope of obtaining peace or reconciliation; an olive branch. 

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 peace offering and widow's mite occurred in a corpus of books? (source: Google Ngram Viewer )