The Pardoner, from Chaucer's Canterbury Tales, attempts to sell his relics to the group after admitting they are fakes. There are a number of interpretations for this seemingly bizarre act. It is possible that he is attempting to show his fellow pilgrims how his performance works.
The Pardoner is a character from Canterbury Tales. The reason the Pardoner still tries to sell the the relics which he just admitted were fakes in the story he told is to show the people what hypocrites the other pilgrims are.