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
Zarphatic language led to the development of Yiddish. It was written by a modified Hebrew script and first appeared in the 11th century, in glosses to texts of the Hebrew Bible and the Talmud written by the great rabbis Rashi and Moshe HaDarshan. Constant expulsions and persecutions, resulting in great waves of Jewish migration, brought about the extinction of Zarphatic by the end of the 14th century. One feature, unlike most other Indo-European Jewish languages, was that to represent vowel sounds, instead of using Hebrew letters with no matching phonemes in the language, it made extensive use of the Tiberian system of