The Convert's Status and the Question of Mamzerut
A woman converted to Judaism through a recognized beit din, married a Jewish man, and bore a son. Ten years later, the beit din that converted her is discovered to have acted irregularly: it did not properly verify her acceptance of mitzvot, and one of the three judges was not qualified. The woman now claims her conversion was invalid and that she is a non-Jew; her son, now twelve, is claimed by her former husband's family to be a mamzer because the marriage was between a Jew and a non-Jew. The son has been raised as a Jew and has had a bar mitzvah. The woman wishes to remarry a kohen.
1. What is the status of the conversion, the marriage, and the son if the original beit din is found to have acted improperly?
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Framework. Conversion requires (a) acceptance of mitzvot (kabbalat ol mitzvot), (b) immersion in a mikveh, and (c) for males, circumcision. A beit din of three qualified judges is required. A conversion performed by an unqualified beit din is of doubtful validity (safek ger). However, the principle of chazakah and the rule that a conversion performed in a recognized community is presumed valid (ger she-nitgayer ke-katan she-nolad) may protect the status.
Application. (1) If the beit din was unqualified, the conversion is safek at best. But a safek ger who has lived as a Jew is treated stringently in some matters and leniently in others. (2) The marriage: if the conversion was invalid, the marriage was between a Jewish man and a non-Jewish woman - no kiddushin - and the son is not a mamzer, because mamzerut requires a forbidden union between Jews (e.g., arayot). A child of a Jewish father and non-Jewish mother is a non-Jew, not a mamzer. (3) The son's bar mitzvah does not change his status. (4) The woman's wish to marry a kohen: a gerushah or chalutzah may not marry a kohen; a giyoret may not marry a kohen either. Even if her conversion is upheld, she is a giyoret and cannot marry a kohen.
Conclusion. The son is not a mamzer; at worst he is a safek ger or non-Jew. The woman cannot marry a kohen. The beit din should investigate and, if necessary, perform a proper conversion for the son upon his reaching majority.
2. How should the beit din handle the son's status to avoid creating a mamzer, and what role does the principle of 'lo tehi ke-chatan' play?
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Avoiding mamzerut. The beit din must be extremely cautious before declaring a child a mamzer, because mamzerut is irreversible and the Torah commands lo tehi ke-chatan - one must not declare a child illegitimate lightly. The principle is that a beit din should seek every leniency (ko'ach de-hetera) to preserve the child's status.
Application. Here, the mother's claim that her conversion was invalid would, if accepted, make the marriage void and the child a non-Jew - not a mamzer. That is actually the more lenient outcome for mamzerut purposes. The husband's family's claim of mamzerut is weaker: a child of a Jewish father and a non-Jewish mother is not a mamzer. The beit din should (a) presume the conversion valid unless proven otherwise (chazakah), (b) if invalid, treat the son as a safek ger and offer him a proper conversion at bar mitzvah age with his consent, and (c) never declare mamzerut absent clear proof of a forbidden Jewish union.
Conclusion. The son should be treated as a Jew pending clarification, and if the conversion is invalid, he should be converted properly. The beit din must not declare him a mamzer.