Owing to their favorable position in the Frankish-German Empire, in which they held land, the Jews were permitted to undertake voyages and carry on business, and were harassed neither by the people nor by the really religious German ecclesiastics; they were also enabled to abandon themselves to their inclination for travel, and thus spread through many of the provinces of Germany. In the ninth century, numbers of them dwelt in the towns of Magdeburg, Merseburg, and Ratisbon. From these points, they penetrated further and further into the countries inhabited by the Slavonians on the further side of the Oder as far as Bohemia and Poland. Meanwhile, in spite of the favor which Charlemagne extended to them, he, like the best men of the Middle Ages, found it difficult to treat them on an entirely equal footing with the Christians. The chasm, which the Fathers of the Church had placed between Christianity and Judaism, and which had been widened by individual ecclesiastics and the synods, was far too deep to be overleapt by an emperor who was devotedly attached to the Church. Charlemagne himself maintained, on one point, a difference between Jew and Christian, and perpetuated it in the peculiar form of the oath which was imposed on the Jews who were witnesses against, or accusers of, a Christian. They were required, in taking an oath against a Christian, to surround themselves with thorns, to take the Torah in their right hand, and to call down upon themselves Naaman's leprosy and the punishment of Korah's faction in witness of the truth of their statement. If there was not a Hebrew copy of the Torah at hand, a Latin Bible was held to be sufficient. It is impossible not to admit, however, that to allow the Jews to testify against a Christian was in itself a deviation from the ordinances of the Church.