For further details, see Harry M. Orlinsky, Essays in Biblical Culture and Bible Translation (New York: Ktav, 1974), pp. 279–81. But see Shaye J. D. Cohen, From the Maccabees to the Mishnah, pp. 50–55, who points out that no Jewish text from the period prior to the destruction of the Temple knows of baptism/immersion as a required ritual of conversion.