Hyrcanus took also Dora and Marissa, cities of Idumea, and subdued all the Idumeans; and permitted them to stay in that country, if they would circumcise their genitals, and make use of the laws of the Jews; and they were so desirous of living in the country of their forefathers, that they submitted to the use of circumcision, and of the rest of the Jewish ways of living; at which time therefore this befell them, that they were hereafter no other than Jews.
Antiquities of the Jews, by Flavius Josephus