All the children of Amru thus dispersed into different parts of Arabia. His eldest son, Salabah bin Amru, chose Al-Hijaz, settled at Al-Madinah, then in the hands of the impious Benu Israel, and became the father of the Aus and Khazraj. In course of time, the new comers were made by Allah an instrument of vengeance against the disobedient Jews. Of the latter people, the two tribes Kurayzah and Nazir claimed certain feudal rights (well known to Europe) upon all occasions of Arab marriages. The Aus and the Khazraj, after enduring this indignity for a time, at length had recourse to one of their kinsmen who, when the family dispersed, had settled in Syria. Abu Jubaylah, thus summoned, marched an army to Al-Madinah, avenged the honour of his blood, and destroyed the power of the Jews, who from that moment became Mawali, or clients to the Arabs. For a time the tribes of Aus and Khazraj, freed from the common enemy, lived in peace and harmony. At last they fell into feuds and fought with fratricidal strife, until the coming of the Prophet effected a reconciliation between them. This did not take place, however, before the Khazraj received, at the battle of Buas (about A.D. 615), a decided defeat from the Aus. It is also related, to prove how Al-Madinah was predestined to a high fate, that nearly three centuries before the siege of the town by Abu Jubaylah, the Tobba [p.350]al-Asghar[FN#17] marched Northward, at the requisition of the Aus and Khazraj tribes, in order to punish the Jews; or, according to others, at the request of the Jews to revenge them upon the Aus and Khazraj. After capturing the town, he left one of his sons to govern it, and marched onwards to conquer Syria and Al-Irak. Suddenly informed that the people of Al-Madinah had treacherously murdered their new prince, the exasperated Tobba returned and attacked the place; and, when his horse was killed under him, he swore that he would never decamp before razing it to the ground. Whereupon two Jewish priests, Ka'ab and Assayd, went over to him and informed him that it was not in the power of man to destroy the town, it being preserved by Allah, as their books proved, for the refuge of His Prophet, the descendant of Ishmael.[FN#18] The Tobba Judaized. Taking four hundred of the priests with him, he departed from Al-Madinah, performed pilgrimage to the Ka'abah of Meccah, which he invested with a splendid covering[FN#19]; and, after erecting a house [p.351]for the expected Prophet, he returned to his capital in Al-Yaman, where he abolished idolatry by the ordeal of fire. He treated his priestly guests with particular attention, and on his death-bed he wrote the following tetrastich:- "I testify of Ahmad that he of a truth "Is a prophet from Allah, the Maker of souls. Be my age extended into his age, I would be to him a Wazir and a cousin."