For the source text click/tap here: Ketubot 102
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A story is told without much detail of a minor boy who was killed by the heirs he lived with on the eve of Pesach.
Another version of the story occurs on erev Rosh HaShana. In both cases, the story demonstrates the heirs' lack of concern for their impurity and sin even before Pesach which requires purity and Rosh Hashana which will involve judgement.
The story was likely moved to Rosh Hashana to avoid the effect of the anti-semitic blood libel lies.
We explore the history of blood libels down to the use by Russians (Beilis case) and Der Sturmer (Nazis).