This commentary examines 4 Maccabees as a contribution to the ongoing reformulation of Jewish identity and practice in the Greek-speaking Diaspora. It analyzes the Jewish author’s interaction with, and facility in, Greek rhetorical conventions, ethical philosophy, and literary culture, giving attention also to his use and interpretation of texts and traditions from the Jewish Scriptures and other Hellenistic Jewish writings. The commentary exhibits the author’s skillful weaving together of all these resources to create a text that interprets the Torah-observant life as the fullest embodiment of the best Greek ethical ideals. A distinctive feature is the examination of how the experience of reading 4 Maccabees in Codex Sinaiticus differs from the experience of reading the eclectic text.