KARAISM - YIDDISH Isaac ben Abraham Troki the Karaites, Hizzuk Emuna (חזוק אמונה), in Yiddish (Strengthened Faith) [polemic against Christianity]. Amsterdam, 1717, [10], 134 ff. Title in simple typographical border. Small in-8, 149 x 96 mm. Bound, title slightly soiled, creases and marginal wear. First and only Yiddish edition of this famous anti-Christian polemical treatise written in the 16th century by the Lithuanian Karaite rabbi Abraham de Troki (Vinograd, Amsterdam 1101; Steinschneider 5301,4; Cowley 259; Zedner 362; Roest 463; Wiener 4023). The Yiddish translator and printer remain anonymous, probably for fear of prosecution by the ecclesiastical authorities.