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The Messiah in Judaism (Hebrew: מָשִׁיחַ, romanized: māšīaḥ) is a savior and liberator figure in Jewish eschatology, who is believed to be the future redeemer of the Jewish people. The concept of messianism originated in Judaism, and in the Hebrew Bible a messiah is a king or High Priest of Israel traditionally anointed with holy anointing oil. However, messiahs were not exclusively Jewish, as the Hebrew Bible refers to Cyrus the Great, king of the first Persian empire, as a messiah for his decree to rebuild the Jerusalem Temple.
In Jewish eschatology, the Messiah is a future Jewish king from the Davidic line, who is expected to be anointed with holy anointing oil and rule the Jewish people during the Messianic Age and world to come. The Messiah is often referred to as "King Messiah" (Hebrew: מלך משיח, romanized: melekh mashiach) or malka meshiḥa in Aramaic.Jewish messianism gave birth to Christianity, which started as a Second Temple period messianic Jewish sect or religious movement.Etymology
In Jewish eschatology, the term mashiach, or "Messiah", refers specifically to a future Jewish king from the Davidic line, who is expected to save the Jewish nation, and will be anointed with holy anointing oil and rule the Jewish people during the Messianic Age. The Messiah is often referred to as "King Messiah", or, in Hebrew, מלך משיח (melekh mashiach), and, in Aramaic, malka meshiḥa. In a generalized sense, messiah has "the connotation of a savior or redeemer who would appear at the end of days and usher in the kingdom of God, the restoration of Israel, or whatever dispensation was considered to be the ideal state of the world."Messianism "denotes a movement, or a system of beliefs and ideas, centered on the expectation of the advent of a messiah." Orthodox views hold that the Messiah will be descended from his father through the line of King David, and will gather the Jews back into the Land of Israel, usher in an era of peace, build the Third Temple, father a male heir, re-institute the Sanhedrin, and so on. The word, mashiach, however, is rarely used in Jewish literature within the 1st century BCE and the 1st century CE.Jewish tradition of the late, or early post-Second Temple period alludes to two redeemers, one suffering and the second fulfilling the traditional messianic role, namely Mashiach ben Yosef, and Mashiach ben David. In general, the term "Messiah" unqualified refers to "Mashiach ben David" (Messiah, son of David).Belief in the future advent of the Messiah was originally a fringe idea, but somewhat controversially, according to Maimonides is one of the fundamental requisites of the Jewish faith, concerning which  has written: "Anyone who does not believe in him, or who does not wait for his arrival, has not merely denied the other prophets, but has also denied the Torah and Moses, our Rabbi."Calculation of appearance
According to the Talmud, the Midrash, and the Zohar, the 'deadline' by which the Messiah must appear is 6000 years from creation (approximately the year 2240 in the Gregorian calendar, though calculations vary). Elaborating on this theme are numerous early and late Jewish scholars, including the Ramban, Isaac Abrabanel, Abraham Ibn Ezra, Rabbeinu Bachya, the Vilna Gaon, the Lubavitcher Rebbe, the Ramchal, Aryeh Kaplan, and Rebbetzin Esther Jungreis.
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