Source: George W.E. Nickelsburg, "The Bible Rewritten and Expanded," Jewish Writings of the Second Temple Period, ed. Michael E. Stone (Philadelphia: Fortress, 1984) 103.
"...many of Jubilees' additions to the biblical text of Genesis and Exodus have the Jew-gentile situation in focus. In addition to the strictures against nakedness and uncircumcision mentioned above (3:31; 15:34), are the following items. Observance of the lunar calendar is construed as following 'the feasts of the gentiles' (sic!) (6:35). Marriage to a gentile is strictly and repeatedly forbidden (20:4; 22:20; 25:1; 27:10; 30:1-15). Warnings are issued against idolatry and consuming blood (6:12-41; 7:30; 21:6). The author stresses Israel's unique covenantal relationship to God and qualitative difference from the gentiles (cf. also 2:31 on the Sabbath). His stringent prohibitions against contact with the gentiles suggest that such contact was not infrequent in the Israel of his time."
This quote is relevant to my paper on IV Maccabees, which asks what II and IV Maccabees mean when they say that the Hellenistic reform challenged Israel's poiliteia (constitution). Here, I see what one Jewish party had against Hellenistic incursions into the nation. At the same time, II and IV Maccabees may not agree with Jubilees on everything, since the Hasmoneans (whom the Maccabees books endorse) supported the lunar calendar, which Jubilees opposed.