Esh Kodesh (Sacred Fire) is a collection of 86 discourses delivered by Rabbi Kalonymous Kalman Shapira, the Piaseczno rebbe, in the Warsaw Ghetto. Referred to by the author as Torah Novella from the Years of Fury, the work grapples with the suffering he and his followers experienced, seeking to maintain faith while rejecting simplistic explanations for the horrors of the Holocaust." Rabbi Shapira recorded and annotated the sermons over several years before passing them to a group that buried them