Ancient Hebrew writings the Tannaim (rabbis cited in the Mishnah), the spoken vernacular of Jews in Judaea was a late form of Hebrew known as Rabbinic or Mishnaic Hebrew, whereas during the period of the Amoraim (rabbis cited in the Gemara), which began around 200 CE, the spoken vernacular was Aramaic. Hebrew continued to be used for the writing of religious texts, poetry, and so forth. There are significant differences between the two Talmud compilations. The language of the Jerusalem Talmud is a Western Aramaic dialect, which differs from the form of Aramaic in the Babylonian Talmud. The Jerusalem Talmud is often fragmentary
Revival of the Hebrew language or Yishuv grew, the immigrants arriving from the diaspora did not speak Hebrew as a mother tongue, and learned it as a second language either prior to their immigration or in Palestine, while their children picked up Hebrew as their native language. At this time, the use of Hebrew as the "lingua franca" of the Yishuv was already a" fait accompli", and the revival process was no longer a process of creation, but a process of expansion. In Tel Aviv, the Legion of the Defenders of the Language was established, which worked to enforce Hebrew use. Jews who were overheard