Revival of the Hebrew language well-recognized sources, chiefly the Tanakh (especially those portions used liturgically like the Torah, Haftarot, Megilot, and the Book of Psalms) and the Mishnah. Apart from these, Hebrew was known through hymns, prayers, midrashim, and the like. During the Middle Ages, Hebrew continued in use as a written language in Rabbinical literature, including in judgments of Halakha, Responsa, and books of meditation. In most cases, certainly in the base of Hebrew's revival, 18th- and 19th-century Europe, the use of Hebrew was not at all natural, but heavy in flowery language and quotations, non-grammatical forms, and mixing-in of other languages, especially Aramaic.
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