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.