In an era when cannibalism occupied the European imagination and became a political weapon that could be effectively aimed against the Other within or elsewhere, as well as a test case for the concept of humanity, it is hardly surprising to find similar rhetoric in internal Jewish discourse of the early modern era. This article shows Rabbi Jacob Emden's contribution to this discourse in the eighteenth century, and extends the boundaries of the scholarly discussion beyond establishing Jewish-Christian proximity. Emden's halakhic position on the question “Is it permissible to benefit from the cadaver of a dead gentile?” (She'elat Ya‘aveẓ) connects cannibalism and theological heresy springing from an overly literal reading of the rabbinical canon, as well as ties it to the concept of the seven Noahide laws. For Emden, the consumption of human flesh, literally and particularly metaphorically, distinguishes between the sons of Noah and heretics, as well as between humanity and savages. Emden advanced this concept in his polemical writings against the Sabbatian heresy in the 1750s, when he became embroiled in controversy with Rabbi Jonathan Eibeschütz and the Frankists.