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.
The Jews of Arabia, enjoying complete liberty, and being subjected to no restraint, were able to defend their religious opinions without fear, and to communicate them with impunity to their heathen neighbors. The Arab mind, susceptible to intellectual promptings, was delighted with the simple, sublime contents of the Bible, and by degrees certain Jewish conceptions and religious ideas became familiar and current in Arabia. The Arabian Jews made their neighbors acquainted with a calendar-system, without which the latter were completely at sea in the arrangement of their holy seasons; learned Jews from Yathrib taught the Arabs to insert another month in their lunar year, which was far in arrear of the solar year. The Arabs adopted the nineteen-years cycle of the Jews (about 420), and called the intercalary month Nasi, doubtless from the circumstance that the Jews were accustomed to receive their calendar for the festivals from their Nasi (Patriarch).
The Jews even succeeded in instructing the Arabs in regard to their historical origin, concerning which their memories were void, and in their credulity the latter accepted this genealogy as the true one. It was of great consequence to the Jews to be regarded and acknowledged by the Arabs as their kinsmen, and too many points of social interest were bound up with this relationship for them to allow it to escape their attention. The holy city of Mecca (Alcharam), the chief city of the country, was built round an ancient temple (Kaaba, the Square), or more properly, round a black stone; for all Arabs it was an asylum, in which the sword durst not quit the sheath. The five fairs, the most important of which was at Okaz, could be frequented only in the four holy months of the year, when the truce of God prevailed. Whoever desired to take advantage of these periods and to enjoy security of life in the midst of a warlike people, not over-scrupulous in the matter of shedding blood, was obliged to establish his relationship to the Arabs, otherwise he was excluded from these privileges.
Happily, the Arabian Jews bethought them of the genealogy of the Arabs as set forth in the first book of the Pentateuch, and seized upon it as the instrument by which to prove their kinship with them. The Jews were convinced that they were related to the Arabs on two sides, through Yoktan and through Ishmael. Under their instruction, therefore, the two principal Arabian tribes traced back the line of their ancestors to these two progenitors, the real Arabs (the Himyarites) supposing themselves to be descended from Yoktan; the pseudo-Arabs in the north, on the other hand, deriving their origin from Ishmael. These points of contact granted, the Jews had ample opportunity to multiply the proofs of their relationship. The Arabs loved genealogical tables, and were delighted to be able to follow their descent and history so far into hoary antiquity; accordingly, all this appeared to them both evident and flattering. They consequently exerted themselves to bring their genealogical records and traditions into unison with the Biblical accounts. Although their traditions extended over less than six centuries on the one side to their progenitor Yarob and his sons or grandsons Himyar and Kachtan, and on the other, to Adnan, yet in their utter disregard of historical accuracy, this fact constituted no obstacle. Without a scruple, the southern Arabians called themselves Kachtanites, and the northern Arabians Ishmaelites. They readily accorded to the Jews the rights of relationship, that is to say, equality and all the advantages attending it.
The Arabs were thus in intimate intercourse with the Jews, and the sons of the desert, whose unpoetical mythology afforded them no matter for inspiration, derived much instruction from Judaism. Under these circumstances many Arabs could not fail to develop peculiar affection for Judaism, and some embraced this religion, though their conversion had not been thought of by the Jews. As they had practised circumcision while heathen, their conversion to Judaism was particularly easy. The members of a family among the Arabs were indissolubly bound to one another, and, according to their phylarchic constitution, the individuals identified themselves with the tribe. This brought about, that when a chieftain became a Jew, his whole clan at once followed him, the wisest, into the fold of Judaism. It is expressly recorded about several Arabian tribes that they were converted to Judaism; such were the Benu-Kinanah, a warlike, quarrelsome clan, related to the most respected Koraishites of Mecca, and several other families of the tribes Aus and Chazraj in Yathrib.
Especially memorable, however, in the history of the Arabs is the conversion to Judaism of a powerful king of Yemen. The princes or kings of Yemen bore the name of Tobba, and at times ruled over the whole of Arabia; they traced their historical origin back to Himyar, their legendary origin to Kachtan. One of these kings, who went by the name of Abu-Kariba Assad-Tobban, was a man of judgment, knowledge, poetical endowments, and of valor which incited him to conquest. Abu-Kariba therefore undertook (about 500) an expedition against Persia and the Arabian provinces of the Byzantine empire. On his march he passed through Yathrib, the capital of northern Arabia, and not expecting treachery from the inhabitants of the town, left his son there as governor. Hardly, however, had he proceeded further, when he received the sad intelligence that the people of Yathrib had killed his son. Smitten with grief, he turned back in order to wreak bloody vengeance on the perfidious city, and after cutting down the palm trees, from which the inhabitants derived their principal sustenance, laid siege to it with his numerous band of warriors. A Jewish poet composed an elegy on the ruined palm trees, which the Arabs loved like living beings, and the destruction of which they bewailed like the death of dear relatives. The Jews rivaled the Chazraj Arabs in bravery in resisting Abu-Kariba's attack, and finally succeeded in tiring out his troops. During the siege, the Himyarite king was seized with a severe illness, and no fresh water could be discovered in the neighborhood to quench his burning thirst. Two Jewish teachers of the Law from Yathrib, Kaab and Assad by name, took advantage of Abu-Kariba's exhaustion to betake themselves to his tent, and persuade him to pardon the inhabitants of Yathrib and raise the siege. The Arabs have woven a tissue of legend about this interview, but it is certain that the Jewish sages found opportunity to discourse to Abu-Kariba of Judaism, and succeeded in inspiring him with a lively interest for it. The exhortations of Kaab and Assad raised his sympathy to so high a pitch that he determined to embrace the Jewish faith, and induced the Himyarite army to do likewise.
At his desire the two Jewish sages of Yathrib accompanied him to Yemen, in order to convert his people to Judaism. This conversion, however, was not easy, for a nation does not cast off its opinions, usages and bad habits at will. There remained as many heathens as Jews in the land; they retained their temples, and were allowed to profess their religion unmolested. Altogether the Judaism which the king of Yemen professed must have been very superficial, and cannot have influenced to an appreciable extent the customs or the mode of living of the people. A prince of the noble tribe of the Kendites, a nephew of the king of Yemen, Harith Ibn-Amru by name, also embraced the Jewish faith. Abu-Kariba appointed him as viceroy of the Maaddites on the Red Sea, and also gave him the government of Mecca and Yathrib. With Harith a number