Anan expounded his views concerning religious commandments and prohibitions in three works, one of which was a commentary on the Pentateuch, certainly the very first of all productions of this class. Anan's works have not survived the lapse of time; the original character of Karaism is thus enveloped in complete obscurity. This only is clear, that in his hostility to the Talmud the founder of the Karaite sect increased rather than lessened the religious duties of life, enforced many observances which time and custom had long abolished, and in his blind eagerness to change the Talmudical exposition of the Law, often fell into ridiculous exaggerations. He made use of the Talmudical, or more properly the Mishnaic rules of interpretation, and with their help considered himself entitled, equally with the old teachers (of the Mishna), to deduce new laws of religion. The most important alterations were those made in the dates of the festivals, the Sabbath, in the laws of marriage, and the dietary regulations. Anan abolished the fixed calendar, which had been established in the middle of the fourth century; but finding no grounds in the Bible for this innovation, he was obliged to refer back to the time of the Second Temple and the Tanaites. As in former times, the beginning of every month was to be fixed by observation of the new moon. The leap years were not to follow in a regular series, according to the nineteen-years cycle, but were to be determined by repeated examination of the condition of the crops, especially at the time of the ripening of the barley. This was not so much an absolute innovation as a renewal of a method of regulating the festivals, the untenableness of which in the state of dispersion of the Jewish nation is evident. This variability of the calendar offered but little difficulty to Anan and his followers in Palestine, but it shows little foresight for the future. As had been formerly done by the Sadducees, Anan fixed the Feast of Pentecost fifty days after the Sabbath following the Passover.
In the strict observance of the Sabbath, Anan far outstripped the Talmud. He pronounced it unlawful to administer any medicines on the Sabbath, even in the case of dangerous illness, or to perform the operation of circumcision, or to leave the house in those cities where the Jews did not live separate from the non-Jewish population; he did not allow any warm food to be eaten, nor even a light or fire to be kindled on the eve of the Sabbath by the Jews themselves, or by others for their use. Anan introduced the custom among the Karaites of spending the Sabbath-eve in entire darkness. All these alterations and many others he pretended to deduce from the letter of the Bible. He made the laws relating to food severe beyond all measure, and he extended the prohibition of marriage to relatives who, according to the Talmud, were allowed to intermarry, so that the marriage of uncle and niece and of step-brothers and sisters, who were absolutely unrelated to one another, was regarded by him as incest. Compared with this exaggerated severity, of what importance was the abolition of the phylacteries (Tephillin), of the festal plants at the Feast of Tabernacles, and of the festival of Dedication, instituted in remembrance of the time of the Hasmoneans, and of other trifles? As his opponents rightly affirmed, he set up a new and much stricter Talmud. Religious life was thus invested by Anan with a gloomy and unpoetical character. The forms of prayer, which had been employed during many centuries, some of which had been in use in the Temple, were forbidden by the founder of this sect to be used in the synagogue, and they were banished, together with the prayers of the poetanim. Instead of them, only Biblical selections, made without taste, were to be read out in the manner of a litany in the Karaite synagogues. As the Jews of the Islamic empire were possessed of their own jurisdiction, Anan's innovations dealt also with points of civil law. In opposition to the text of the Bible, he placed the female heirs on an equal footing with the males with reference to property inherited from parents, while on the other hand he denied to the husband the right of succeeding to the property of his deceased wife.
But although Anan gave great impetus to the study of the Bible, the system of vowel points having been already introduced, thus enabling all men to read the Scriptures, nevertheless the age in which he lived was neither ripe enough nor his mind sufficiently comprehensive to enable him to produce a healthy, independent exposition of the text. He himself was obliged, in order to establish his innovations, to have recourse to forced interpretations, such as would hardly have been proposed by the Talmudists whom he reviled. In rejecting the Talmud, he broke the bridge connecting the Biblical past with the present. The religion of the Karaites is thus no natural growth, but an entirely artificial and labored creation. Anan had no regard for the customs and sentiments of the people. As his system of religion depended on the interpretation of the Scripture, Karaism naturally was unsettled in character. A new explanation of the text might threaten the very foundations of religious life, for what had been lawful might become unlawful, and vice versâ. Anan was as devoid of the power of appreciating poetry as of understanding history. The sacred prophetic and poetic literature was of no further use to him than to prove the existence of some law or some religious command. He closed the gates of the sanctuary on the newly-awakened poetical impulse.
It is singular that Anan and his followers justified their opposition to the Talmud by the example of the founder of Christianity. According to their idea, Jesus was a God-fearing, holy man, who had not desired to be recognized as a prophet, nor to set up a new religion in opposition to Judaism, but simply to confirm the precepts of the Torah and to abrogate laws imposed by human authority. Besides acknowledging the founder of Christianity, Anan also recognized Mahomet as the prophet of the Arabs. But he did not admit that the Torah had been repealed either by Jesus or by Mahomet, but held it to be binding for all time.
It is impossible to ascertain the number of Anan's adherents who followed him into exile. His disciples called themselves, after him, Ananites and Karaites (Karaim, Bene Mikra), while to their adversaries they gave the nickname of Rabbanites, which is equivalent to "Partisans of Authority." At first the irritation existing between the two parties was extremely violent. It is hardly necessary to say that the representatives of the colleges placed the chief of the party and his adherents under a ban of excommunication, and excluded them from the pale of Judaism. But on their side, the Karaites renounced all connection with the Rabbanites, entered into no marriage with them, refused to eat at their table, and even abstained from visiting the house of a Rabbanite on the Sabbath, because they considered that the holy day was desecrated there. The Rabbanites pronounced the Karaites heretics, preached against them from the pulpit, especially against their custom of spending the Sabbath-eve in darkness, and refused to allow the followers of Anan to take part in the prayers. The Karaites, on the other hand, could not sufficiently abuse the two colleges and their representatives. They applied to them the allegory of the prophet Zachariah, of the two women who carried Sin in a bushel to Babylon, and there founded a dwelling-place for her. "The two women are the Geonim in Sora and Anbar (Pumbeditha)." This satire, which probably originated with Anan, became current among the Karaites, and they never called the two colleges otherwise than "the two women."
Thus, for the third time, the Jewish race was divided into two hostile camps. Like Israel and Judah, during the first period, and the Pharisees and Sadducees in the time of the Second Temple, the Rabbanites and Karaites were now in opposition to each other. Jerusalem, the holy mother, who had witnessed so many wars between her sons, again became the scene of a fratricidal struggle. The Karaite community, which had withdrawn from the general union, acknowledged Anan as the legitimate Prince of the Captivity, and conferred this honorable title on him and his descendants. Both parties exerted themselves as much as possible to widen the breach.
After Anan's death, his followers, out of reverence, introduced memorial prayers for him into the Sabbath service. They prayed for him thus: "May God be merciful to the Prince Anan, the man of God, who opened the way to the Torah, and opened the eyes of the Karaites; who redeemed many from sin, and showed us the way to righteousness. May God grant him a good place among the seven classes who enter into Paradise." This service, in memory of Anan, is still in use with the Karaites of the present day.
It is impossible, however, for impartial judgment to endorse this encomium, for it is impossible to discern in Anan any greatness of mind. He was not a profound thinker, and was entirely devoid of philosophical