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The theme is summed up in these words at the end of the tale: There is, in Avicenna's long relation
Concerning poison and its operation,
Trust me, no ghastlier section to transcend
What these two wretches suffered at their end.
Thus, these two murderers received their due,
So did the treacherous young poisoner, too."
What is Chaucer's The Pardoner's Tale?