The chabad chassid Rav Raphel Kohen heard this from his father Rav Baruch Sholom Kohen:
During the time that the two Shapiro brothers of Slovita were imprisoned they did their best to daven and recite Tehillim. There was among the prisoners, an apostate and heretic who knew enough Jewish law and halachah to try to harm the brothers. His hatred of all Jewish matters led him to act, and so he filled the chamber pot and befouled the cell to prevent them from reciting any holy words. Rav Pinchos Koretzer's grandson were momentarily dismayed and downcast, what would they do now? How could they daven? Suddenly, one of the two was struck with inspiration: It's true we cannot say Tehillim but is that a reason for our spirits to fail or falter?! We must rejoice and be happy that as Jews that alone is an avodah! The very fact that we refrain also fulfills the Divine Will of our Creator! And if so we need to be beSimchah and thus they began to dance in jail over their very Jewishness! (Shmuos VeSippurim Volume I pg 244)
