linguistic:voice_change, quality:corruption
Interdenominational recognition

Historically and until the present, recognition of a rabbi relates to a community's perception of the rabbi's competence to interpret Jewish law and act as a teacher on central matters within Judaism. More broadly speaking, it is also an issue of being a worthy successor to a sacred legacy.

As a result, there have always been greater or lesser disputes about the legitimacy and authority of rabbis. Historical examples include Samaritans and Karaites.

The divisions between Jewish denominations may have their most pronounced manifestation on whether rabbis from one denomination recognize the legitimacy or authority of rabbis in another.

As a general rule within Orthodoxy and among some in the Conservative movement, rabbis are reluctant to accept the authority of other rabbis whose Halakhic standards are not as strict as their own. In some cases, this leads to an outright rejection of even the legitimacy of other rabbis; in others, the more lenient rabbi may be recognized as a spiritual leader of a particular community but may not be accepted as a credible authority on Jewish law.

These debates cause great problems for recognition of Jewish marriages, conversions, and other life decisions that are touched by Jewish law. Orthodox rabbis do not recognize conversions by non-Orthodox rabbis. Conservative rabbis recognise all conversions done according to Halakha. Finally, the North American Reform and Reconstructionists recognize patrilineality, under certain circumstances, as a valid claim towards Judaism, whereas Conservative and Orthodox maintain the position expressed in the Talmud and Codes that one can be a Jew only through matrilineality (born of a Jewish mother) or through conversion to Judaism.