Does the Mosaic Law Obligate Christians? The Fate of the Gentiles in Ḥizzuq ʾEmunah by 16th-Century Karaite Jewish Polemicist Isaac Ben Abraham of Troki

Ḥizzuq ʾEmunah (Faith Strengthened), written by the 16th-century Karaite Jewish scholar Isaac ben Abraham of Troki (Polish–Lithuanian Commonwealth), was one of the most renowned Hebrew anti-Christian polemical works, meriting translation into most European languages. Troki authored his book during the Polish Reformation, a period marked by intense interactions and theological debates between Jews and Christians of various denominations. The author provides a comprehensive philological, grammatical, and historical analysis of the New Testament while relying heavily on the ideas and scriptural interpretations of radical Protestant theologians and Rabbanite scholars. Ḥizzuq ʾEmunah is unusual in a number of respects. This paper examines one such peculiarity—namely, the author’s view that the Torah and its commandments obligate Christians—as well as his eschatological model in which Christians will become part of Israel in the messianic age. His perspective is examined in our study with particular attention to the range of argumentative methods employed. Among these are the use of evidence from the New Testament, especially the accounts of Jesus and his disciples observing the commandments, and the contrast of early Christians’ conceptions and practices, which he views as close to the Mosaic law, with later Christian interpretations of the Old and the New Testament.