Ancient Greek religion
The biblical term "proselyte" is an anglicization of the Koine Greek term προσήλυτος ("proselytos"), as used in the Septuagint (Greek Old Testament) for "stranger", i.e. a "newcomer to Israel"; a "sojourner in the land", and in the Greek New Testament for a first-century convert to Judaism, generally from Ancient Greek religion. It is a translation of the Biblical Hebrew phrase גר תושב ("ger toshav").