The article analyzes the influence of the kabbalistic doctrine of Sabbatianism on the messianic philosophy of Giorgio Agamben. I argue against Simon Critchley that Agamben's critique of the sovereign law is not inspired by Marcion's idea of the total annihilation of law but by Sabbatai Zevi's project of deactivating its repressive function. I further argue that Agamben also adopts the Sabbatian idea of Marranic messianism, which makes him repeatedly contaminate the Jewish tradition with foreign influences. Although this strategy is potentially fruitful, it eventually leads Agamben to overemphasize antinomianism and problematically associate all Jewish-based messianism with the radical critique of law. In the article, I demonstrate that things are more complex and even in the openly antinomian works of Walter Benjamin - Agamben's greatest philosophical inspiration - Jewish law is endued with some emancipatory potential.