Most of the changes made by the Hasidim were the product of the Hasidic approach to
Kabbalah, mainly as expressed by
Isaac Luria (1534 – 1572) and his disciples—particularly
Hayyim ben Joseph Vital (1543–1620). Luria greatly influenced both misnagdim and Hasidim, but the former feared what they perceived as disturbing parallels in Hasidism to the
heretical Sabbateans. An example of such an idea was that God entirely nullifies the universe. Depending on how this idea was preached and interpreted, it could give rise to
pantheism, universally acknowledged as heresy, or lead to immoral behavior since elements of Kabbalah can be misconstrued to de-emphasize ritual and glorify sexual metaphors as a more profound means of grasping some inner hidden notions in the Torah based on the Jews' intimate relationship with God. If God is present in everything, and if divinity is to be grasped in erotic terms, then—Misnagdim feared—Hasidim might feel justified in neglecting legal distinctions between the holy and the profane, and in engaging in inappropriate sexual activities. The Misnagdim were seen as using
yeshivas and scholarship as the learning center. At the same time, Hasidic learning centered around the rebbe, which was tied in with what they considered emotional displays of piety. The stress of
Jewish prayer over Torah study and the Hasidic reinterpretation of ''Torah l'shma'' (Torah study for its own sake) was seen as a rejection of traditional Judaism. Hasidim did not follow the traditional
Ashkenazi prayer rite and instead used a combination of Ashkenazi and
Sephardi rites and Lurianic Kabbalistic concepts known as
Nusach Sefard. This was seen as a rejection of the traditional liturgy and, due to the resulting need for separate
synagogues, a breach of communal unity. In addition, they faced criticism for neglecting the
halakhic times for prayer. Hasidic Jews also added some
halakhic stringencies to
kashrut, the laws of keeping kosher. They made specific changes in how livestock was slaughtered and in who was considered a reliable
mashgiach (a legal supervisor of
kashrut). The result was that they essentially did not accept as kosher certain foods that were accepted as kosher by Misnagdim. This was seen as a change of traditional Judaism, an over-stringency of
Halakha, and, again, a breach of communal unity. ==Response to the rise of Hasidism==