The knowledge of their religion, which the Arabian Jews had brought with them in their flight from Judæa, and that which afterwards came to them from the academies, conferred upon them superiority over the heathen tribes, and soon made them their masters. While but few Arabs, before the latter part of the seventh century, were familiar with the art of writing, it was universally understood by the Jews, who made use, however, of the square, the so-called Assyrian characters. As the few Arabs that succeeded in learning to write generally employed the Hebrew characters, it would appear that they first acquired the art of writing from the Jews. Every Jew in Arabia was probably able to read the Holy Scriptures, for which reason the Arabs called the Jews the "nation of writing" (Ahl' ul kitab). In the form in which it was transmitted to them, that is to say, with the character impressed upon it by the Tanaim and the Amoraim, Judaism was most holy to the Arabian Jews. They strictly observed the dietary laws, and solemnized the festivals, and the fast of Yom-Kippur, which they called Ashura. They celebrated the Sabbath with such rigor that in spite of their delight in war, and the opportunity for enjoying it, their sword remained in its scabbard on that day. Although they had nothing to complain of in this hospitable country, which they were able to regard and love as their fatherland, they yearned nevertheless to return to the holy land of their fathers, and daily awaited the coming of the Messiah. Like all the Jews of the globe, therefore, they turned their face in prayer towards Jerusalem. They were in communication with the Jews of Palestine, and even after the fall of the Patriarchate, willingly subordinated themselves to the authorities in Tiberias, whence they received, as also from the Babylonian academies probably, religious instruction and interpretation of the Bible. Yathrib was the seat of Jewish learning, and possessed teachers of the Law (Achbâr, Chabar) who expounded the Scriptures in an academy (Midras). But the knowledge of the Bible which the Arabian Jews possessed was not considerable. They were acquainted with it only through the medium of the Agadic exegesis, which had become familiar to them in their travels or had been brought to them by immigrants. For them the glorious history of the past coalesced so completely with the Agadic additions that they were no longer able to separate the gold from the dross. Endowed with poetical fancy, the Arabian Jews on their side embellished the Biblical history with interesting legends, which were afterwards circulated as actual facts.