In 840, Alvaro began a correspondence with the former Bishop Bodo, a Christian convert to Judaism, wherein each tried to convince the other to return to their old faith. Many of their letters have been preserved.
- Richard Gottheil and Hermann Vogelstein, Bodo Jewish Encyclopedia
- Pablo Alvaro Jewish Encyclopedia
- Corré, Alan D. The Bishop's Letter
- Epstein, Lawrence The Theory and Practice of Welcoming Converts to Judaism
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