Conflicting Attitudes to Conversion in Judaism, Past and Present

Evidence suggests that conversion originated during the Babylonian Exile. Around the same time, biological genealogy was gaining popularity, especially among priests whose legitimacy was becoming increasingly defined by 'pure' pedigree. When the biological, or ethnic, criterion is extended to the definition of Jewishness, as it seems to have been by Ezra, the possibility of conversion is all but precluded. The Rabbis did not reject the primacy of genealogy, yet were also heirs to a strong p...