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.
Yemenite Hebrew well as the "ḥaṭaf sǝġūl", are all actually one and the same vowel (in the Babylonian tradition), and it is as though he had written two "shǝwa"s one after the other. Likewise, in the possessive case, “belonging to her companion” ⇒ שֶׁלַּחֲבִרְתָּהּ, the "lamed" in the preposition של is written with the vowel "pataḥ". The Leiden MS. of the Jerusalem Talmud is important in that it preserves some earlier variants to textual readings of that Talmud, such as in Tractate "Pesaḥim" 10:3 (70a), which brings down the old Palestinian-Hebrew word for "charoseth" (the sweet relish eaten at Passover), viz. "dūkeh"