The Prince of the Captivity of that period seems to have shown special regard for such Babylonians as were learned in the Law, in his appointments to the offices within his gift. He nominated as supreme judge in Cafri one of his relations, Mar-Ukba, whose wealth, modesty, character, and knowledge of the Law well fitted him for this post. He also appointed Karna as judge, who, not being rich, was obliged to be indemnified for his loss of time by the suitors. To Abba-Areka was given the post of inspector of markets (Agora-nomos), carrying with it the control of the weights and measures.
The arbitrariness of the rule of the Exilarch is well illustrated by the following example. Abba-Areka had been commanded to control the prices of the market, and to prevent the necessaries of life from becoming too dear. Having refused to obey this order, he was thrown into prison and kept there until Karna upbraided the Prince of the Captivity with thus punishing a man who was full of the "juice of dates" (genius). Abba-Areka had occasion, by reason of his position as Agoranomos, to journey to the various districts of Jewish Babylonia, and he thus became known throughout the country. Artabanus IV (211–226), the last Parthian monarch of the house of Arsaces, who had probably made his acquaintance on one of his circuits, esteemed him so highly that he once sent him a present of some valuable pearls. Between the last Parthian King and the first Babylonian Amora there existed the same friendly relations as between the Jewish Patriarch and the Roman Emperor of his time. Artabanus was afterwards deposed by Ardashir, and with him ended the dynasty of Arsaces. When Rab heard of the fall of Artabanus, he exclaimed sorrowfully, "The bond is broken."
Abba discovered with surprise during his journeys the unbounded ignorance of the Jewish laws into which those communities remote from the capital had fallen. In one place nothing was known of the traditional prohibition forbidding meat to be eaten with milk. In order to repress these transgressions and to remove this ignorance, Rab extended many laws, and forbade even what was otherwise allowed. In this way there arose many restrictions which, owing to his authority, acquired the force of law. The negligence existing throughout the district of Sora gave him the idea of founding an academy in that very place, in order that the knowledge of the Law might become more widely spread through the passage to and fro of the disciples. His efforts were crowned with complete success. If the development of the Law has greatly contributed to the preservation of Judaism, this result is for the most part due to the labors of Abba-Areka. With but few intermissions, Sora was the seat of Jewish science for nearly eight centuries.
The academy, which bore, as was customary, the name of "Sidra," was opened by Abba about the year 219. Twelve hundred disciples, attracted by Abba-Areka's reputation, flocked together from every district of Babylonia. More than a hundred celebrated disciples and associates afterwards disseminated his maxims and decisions throughout the land. The throng of auditors was so great that he was obliged to enlarge his lecture-room by enclosing a garden belonging to a recently deceased proselyte, which he acquired for this purpose as vacant ground. The reverence entertained for him by his disciples was so profound that they called him simply "Rab," the Teacher, in the same way as the Patriarch Judah was called Rabbi or Rabbenu, and this is the appellation by which he is generally known. His school was called Be-Rab (Be abbreviated from Beth, house), which afterwards became the general name for a school. His authority extended beyond the boundaries of Babylonia; even Jochanan, the most celebrated of the teachers of Judæa, wrote to him, "To our teacher in Babylonia," grew angry whenever any one spoke slightingly of Rab, and admitted that the latter was the only person to whom he would have willingly subordinated himself. Rab was accustomed to maintain such of his numerous disciples as were without means, for he was very wealthy, and owned land, which he cultivated himself. The excellent arrangements which he adopted permitted his auditors to devote themselves to the study of the Law without neglecting their livelihood. In two months of the year (Adar and Ellul), at the commencement of autumn and spring, they assembled at Sora. During these two months, which were called "months of assembly" (Yarche Kalla), lectures were delivered every day from the early morning on; the auditors hardly allowed themselves time enough to swallow their breakfast. The ordinary name for the public lectures was Kalla. Besides these two months, Rab devoted the week before the principal festivals to public lectures, in which not only the disciples, but the whole populace, were interested. The Prince of the Captivity used also to arrive in Sora about this time to receive the homage of the assembled crowd. The throng was generally so great that many were unable to get lodgings in the houses, and were consequently obliged to sleep in the open air, on the shore of lake Sora. These festival lectures were termed Rigle. The Kalla-months and the Rigle-week had also certain influences upon civil life; the judicial powers suspended their operation during these periods, and creditors were forbidden to summon their debtors before the court. Rab thus provided at one and the same time for the instruction of the ignorant multitude, and for the further advancement of the deeper study of the Law by the education of disciples.
Nothing is known of any peculiar method employed by Rab. His mode of teaching consisted of analyzing the Mishna, which he had brought with him in its latest state of perfection, of explaining the text and the sense of every Halacha, and of comparing them with the Boraitas. Of these decisions and deductions, which are known by the name of Memra, there exists a great number from Rab's hand, and they, together with those which proceeded from Samuel and Jochanan, the contemporary principals of the schools, form a considerable part of the Talmud. For the most part he was more inclined than his fellow Amoraim to render the Law severer, and to forbid such legal acts as verged on the illegal, at least in the opinion of the multitude of Babylonian Jews, who were incapable of nice discrimination. Most of Rab's decrees received the force of law, with the exception of those, however, which affected municipal law, for his authority was more respected in questions of ritual than of civil law.
With the most determined energy he undertook the amelioration of the morals of the Babylonians, which, like their religion, had fallen to a very low ebb among the lower classes. The ancient simplicity of married life which had formerly obtained was now superseded in Babylonia by a hollow and brutal immorality. If a young man and woman met, and were desirous of uniting in marriage, they summoned the first witnesses at hand, and the marriage was concluded. Fathers gave their daughters in marriage almost before they arrived at majority, and the bridegroom either did not see his bride until after the decisive step had been taken, when, doubtless, he often repented of his act, or else he lived in the house of his intended father-in-law in a too intimate relation with his betrothed. The law, instead of condemning this immorality, had afforded it the protection of its authority. Rab combated these prevailing customs with the full force of a moral ardor. He forbade the solemnization of marriage which had not been preceded by a courtship, and enjoined on fathers not to marry their daughters without the consent of the latter, and therefore still less before their majority. He further admonished all who were desirous of marrying to make the acquaintance of the maiden of their choice before their betrothal, lest when disappointed, their conjugal love should turn to hate, and finally he forbade the young men to live in the house of their betrothed before marriage. He baffled all the legal artifices which could be employed by a husband to make a divorce retrospective by withdrawing the support of the law from such cases. All these moral measures became laws of general application. Rab also increased the reputation of the courts of justice; every one was obliged to appear on being summoned before the court, and the bailiffs were invested with official authority; the punishment of excommunication was introduced for cases of refractoriness. This punishment was very severe in Babylonia, and consequently produced great effects. The transgressions of the offender were publicly announced, and he was avoided until he had made expiation. In Babylonia, where the Jewish population formed a little world of its own, this punishment was sufficient to procure obedience and respect for the laws. Rab's energies were thus employed in two directions; he refined the morals, and aroused intellectual activity in a country which, as the sources express it, had formerly been "a vacant and unprotected fallow field." Rab surrounded it with a two-fold hedge, severity of manners and activity of mind. He was in this respect for Babylonia what Hillel had been for Judæa.
Rab's virtues, his patience, conciliatory disposition, and modesty, also put one in mind of Hillel. He had a bad wife who opposed him in everything, but he bore her vexations with patience. In his youth Rab had acted badly towards Chanina, the head of the school in Sepphoris, and was therefore unceasing in his efforts to obtain his pardon. His forgiving disposition caused him to lose sight of his exalted station. Once, when he thought he had given offense to a man of the lower classes, he repaired to the latter's house on the eve of the Day of Atonement, in order to become reconciled with him. Whenever he was followed to his school by a crowd of people on the days of his lectures he used to repeat a verse of Job, in order to prevent his pride from rising too high: "Though the excellency of man mount up to the heavens, yet he shall perish forever." Before repairing to the court he was wont to exclaim: "I am prepared to meet my death; here the affairs of my house concern me not, and I return empty-handed to my home; may I be as innocent on my return as I was when I set out." He had the satisfaction of leaving a son, Chiya, who was exceedingly learned in the Law, and of marrying his daughter to a relative of the Prince of the Captivity. His descendants by this daughter were worthy and learned princes. His second son, Aibu, was not intellectually distinguished. To him his father recommended certain rules of life, among others a preference for agriculture: "Rather a small plot of land than a great magazine for goods."
For eight and twenty years, until his old age, Rab devoted himself to the Sidra at Sora (219–247). When he died all his disciples accompanied his body to its last resting-place, and went into mourning for him. At the suggestion of one of them Babylonia mourned for him a whole year, and the practice of wearing wreaths of flowers and myrtles at weddings was suspended. All the Jews of Babylonia, except one, Bar-Kasha of Pumbeditha, mourned for the loss of their great Amora.
Much more original and versatile than Rab was his friend, his Halachic opponent, and his fellow-worker in the task of elevating the Jewish population of Babylonia, Samuel or Mar-Samuel, also called Arioch and Yarchinai (born about 180, died 257). In a certain sense this highly talented man was an epoch-maker in the history of the doctrine of Judaism. Nothing more is known of his youth than that he once ran away from his father. As a young man he followed the usual course, and went to Judæa in order to complete his education at the academy of the Patriarch Judah I. It has already been narrated how he there cured a disease of the eyes from which the ailing Patriarch suffered, and how he was nevertheless refused his nomination as a teacher by the latter; how he returned to his home before Rab, and was elevated after Shila's death to the dignity of Resh-Sidra.
Mar-Samuel was of an even character, avoiding enthusiasm and demonstrativeness. While his contemporaries confidently expected the renewal of miracles as of old before the appearance of the Messiah, he propounded the view that everything would still follow its natural course, but that the subjection of Israel to foreign rulers would come to an end. His intellectual energies were employed in three branches of knowledge: the explanation of the Law, astronomy, and medicine.