The Dominican clergy commissioned to preach against the Hussites did not cease to foster Catholic hatred of Jews. From their pulpits they thundered against heretics and Jews alike, cautioning the faithful against holding intercourse with them, and consciously and unconsciously inciting to attacks on their persons and property. The Jews flew for help to the pope, Martin V--doubtless not with empty hands--and again obtained a very favorable bull (23d February, 1422), in which Christians were enjoined to remember that their religion had been inherited from Jews, who were necessary for the corroboration of Christian truth. The pope forbade the monks to preach against intercourse between Jews and Christians, and declared null and void the ban with which transgressors had been threatened. He recommended to Catholics a friendly and benevolent attitude towards their Hebrew fellow-citizens, severely denounced violent attacks upon them, and confirmed all the privileges which had from time to time been granted by the papacy. This bull was, however, as ineffectual as the protection which Emperor Sigismund had so solemnly promised the Jews. A persecuting spirit continued to animate the Christian church. The monks did not cease to declaim against the "accursed" Jewish nation; the populace did not refrain from tormenting, injuring and murdering Jews; even succeeding popes ignored the bull, and restored the odious canonical restrictions in all their stringency. Turning a deaf ear to both pope and emperor, the citizens of Cologne expelled the Jewish community, perhaps the oldest in Germany. The exiles took up their abode at Deutz (1426). In the South German towns, Ravensburg, Ueberlingen and Lindau, the Jews were burnt because of a lying blood accusation (1431).