Classical semicha refers to a specific type of ordination that according to traditional Jewish teaching, traces a line of authority back to Moses and the seventy elders. This line of succession seems to have died out sometime during the fourth or fifth century CE.
A third and distinct meaning of semicha is the laying of hands upon an offering of a korban ("sacrifice") in the times of the Temple in Jerusalem, see Semicha in sacrifices.
According to the Hebrew Bible, Moses ordained Joshua through semicha. (). Moses also ordained the 70 elders (). The elders later ordained their successors in this way. Their successors in turn ordained others. This chain of hands-on semicha continued through the time of the Second Temple, and at least until the time of Hillel II.
Traditionally Moses is also assumed to be the "first rabbi" of the Children of Israel. He is still known to most Jews as Moshe Rabbeinu ("Moses our Teacher"). Moses was also a prophet and is considered to be the greatest of all the Hebrew Bible's prophets. Moses passed his leadership on to Joshua as commanded by God in the Book of Numbers where the subject of semicha ("laying [of hands]" or "ordination") is first mentioned in the Torah:
The title ribbi (or "rabbi") was reserved for those with semicha. The sages of the Babylonian Jewish community had a similar religious education, but without the semicha ceremony they were called rav.
After the failed revolution by Bar Kokhba in 132–135 CE, the Romans put down the revolt, and the emperor Hadrian tried to put a permanent end to the Sanhedrin, the supreme legislative and religious body of the Jewish people. According to the Talmud, Hadrian decreed that anyone who gave or accepted semicha would be killed, any city in which the ceremony took place would be razed, and all crops within a mile of the ceremony's site would be destroyed. The line of succession was saved by Rabbi Yehuda ben Bava's martyrdom: he took two other rabbis and fifty students to a mountain pass far from any settlement or farm, the three rabbis ordained all fifty students, and when the Romans attacked them Rabbi Yehuda blocked the pass with his body allowing the others to escape.
The exact date that the original semicha succession ended is not certain. Many medieval authorities believed that this occurred during the reign of Hillel II, around the year 360 CE. However it seems to have continued at least until 425, when Theodosius II executed Gamaliel VI and suppressed the Patriarchate and Sanhedrin.
While the first two classes are still issued today, the last one is not.
The original line of succession seems to have died out in the fourth or fifth centuries. The Geonim, early medieval Jewish sages of Babylon, did not possess semicha, and did not use the title "rabbi". They were formally known as "rav" and were entrusted with authority to make legal and religious decisions.
Sometime after the Black Death struck Europe, the Jewish community was influenced by the formal issuing of diplomas conferred by European Christian universities. In the areas today known as France and Germany, Ashkenazic Jews began using the term semicha again, this time using it to refer to a formal "diploma" conferred by a teacher on his pupil, entitling the pupil to be called Mori (my teacher). This practice was at first frowned upon by Sephardi Jews, who viewed the practice as "presumptuous and arrogant", and an imitation of gentile customs (in this case, the university doctorate); eventually however this practice was adopted by the Sephardic Jewish community as well.
Maimonides, in his Mishneh Torah, rules that "if all the sages In Israel would unanimously agree to appoint and ordain judges, then these new ordinants would possess the full authority of the original ordained judges" (Hilchoth Sanhedrin 4:11). His code of law was accepted as normative by the majority of Jewish scholars since that time, though this section was mainly viewed as theoretical, especially because he concludes that "the matter needs deciding". The Sanhedrin of Rabbi Jacob Berab purported to enact this into practical law, changing minor details. However, since the legal existence of this Sanhedrin depends on the validity of Maimonides' view, the question is circular.
Berab made an error in not first obtaining the approval of the chief rabbis in Jerusalem, which led to an objection to having a Sanhedrin at that time. One should note that this was not an objection to the semicha, but to reinstituting a Sanhedrin. Levi ibn Habib, the chief rabbi in Jerusalem, wrote that when the nascent Sanhedrin took the authority of a Sanhedrin upon itself, it had to fix the calendar immediately. However, by delaying in this matter, it invalidated itself. Rabbi David ibn abi Zimra (Radvaz) of Egypt was consulted, but when Berab died in 1542 the renewed form of semicha gradually ground to a halt.
At the time the Turkish Empire was crumbling, and losing wars against Russia, Prussia, Austria and others. In attempt to modernize, the Turkish Empire opened itself up to more and more Western "advisors". For the first time the Arabian Peninsula and the Yemen was opened up to westerners. Scientists and Sociologists were convinced that in the Yemen lay communities that had been cut off and isolated from the western world for centuries. At the time, leading European scientific journals seriously considered that the remnants of the "Ten Tribes" would actually be found in the Yemen.
Rav Yisroel of Shklov, influenced both by this rush of scientific thought and interested in utilizing a suggestion of the Radvaz of receiving semicha from one of the "Ten Tribes", specifically Reuven and Gad. Rav Yisroel charted out where he thought the Bnei Reuven were probably located, and sent an emissary, Rav Pinchas Baruch, to locate them (Sefer Halikutim to the Shabsei Frankel edition of Rambam, Hilchos Sanhedrin 4:11). Unfortunately, Rav Baruch did not succeed in locating the shevet of Reuven and he was either killed or died while attending to the medical needs of poor Yemenite villagers.
An interesting point of Jewish Law arises in that Rav Yisroel raised the question how could the Tribe of Reuven have kept the semicha alive, since they were outside the Land of Israel and the semicha can be granted only in Land of Israel. He answered that since the Bnei Reuven had been distant from the rest of Klal Yisroel before this ruling had been accepted, there is no reason to assume that they accepted this ruling, and there was a chance that they were still keeping the institution of semicha alive.
In 1948, with the establishment of the modern State of Israel, the idea of restoring the traditional form of semicha and reestablishing a new "Sanhedrin" became popular among some within the religious Zionist community. Rabbi Yehuda Leib Maimon, Israel's first minister of religious affairs, promoted this idea. A small number of religious Zionist rabbis of Modern Orthodox Judaism's Rabbinical Council of America voiced support for this idea; some rabbis within Conservative Judaism entertained the idea as a potentially positive development. However, most secular Jews, most Haredim, and most non-Orthodox Jews did not approve of this goal. Israel's Chief Ashkenazic rabbi at the time, Isaac Herzog, was hesitant to support this goal, and the idea eventually died away.
This attempt was intended to be an improvement on Rabbi Jacob Berab's attempt by contacting seven hundred rabbis across Israel, as opposed to Jacob Berab's election by twenty five rabbis of Safed. The current members mostly behave as place holders and have publicly expressed their intention to step aside when more worthy candidates join. Rabbi Adin Steinsaltz the Nasi of the Sanhedrin said I'd be happy if in another few years these chairs are filled by scholars who are greater than us and we can say: `I kept the chairs warm for you.' The current attempt to re-establish the Sanhedrin is the sixth attempt in recent history, but unlike previous attempts, there seems to be wide consensus among the leading Torah sages living in the Land of Israel of the pressing need for such an institution at this time, due to the moral climate created by actions of the State of Israel which have been perceived by communities around the world both Jewish and Gentile as controversial.
Although presently most functioning synagogue (i.e. "pulpit") rabbis hold semicha, this was until quite recently not always required, and in fact many Haredi rabbis may possibly not be required to hold a "formal" semicha even though they may occupy important rabbinical and leadership positions. The reasons being that what is prized in the communities they serve and lead is most of all a supreme mastery of the Talmud with a vast knowledge of the commentaries of the Rishonim and Acharonim and Responsa, added to knowledge of the Shulchan Aruch and Halakha ("Jewish Law"). Many Hasidic rebbes and Rosh yeshivas of major Orthodox yeshivas are not required to "prove" to their flocks that they do or do not hold formal semicha because their reputations as Torah-scholars and sages is unquestioned and esteemed based on the recommendations of trusted sages, and the experiences and interactions that many knowledgeable Torah-observant Jews have with them, which thus gives practical testimony based on experience that these great rabbis are indeed worthy to be called as such. For example, Rabbi Yisrael Meir Kagan, also known as the Chafetz Chayim, probably one of the most famous rabbis of the early 20th century, was trained and recognized as a rabbi, but did not hold semicha until he had to apply for a passport. He realized that unless he obtained a written document of semicha, he could not technically enter "rabbi" as an occupation without lying. He then received his semicha by telegraph from Rabbi Chaim Ozer Grodzinski of Wilna, an unusual arrangement - especially in the early 20th century. Most current poskim, however, do have semicha. In the UK, a communal minister who does not have semicha has the title "Reverend" rather than "Rabbi".

Not all present-day rabbis have semicha
See also
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Further reading
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