From roughly 100 BCE to 68 CE, there was a Jewish settlement at Qumran, near the Dead Sea, that seems to have been populated by members of a particular sect. Most experts believe that the Dead Sea Scrolls—all found close by—include documents pertaining to the beliefs and practices of the Qumran sectarians. Jutta Jokiranta explains:
Part of the Qumran collection consists of sectarian documents that reveal a distinct socio-religious movement with unique features within this larger matrix of diversity. The members of this “Qumran movement” formed an association that kept property in common and had regulations concerning meals and consumption of food, marriages and sexual practices, purity practices, Temple rituals, Sabbath observance, the festival calendar, and education. Determinism and expectations of the end-time characterized the belief system of the movement.
We do not presently know if the archaeological site at Qumran, close to the caves where the scrolls were found, served the whole movement or only this particular community. It is very likely that the movement was not restricted to this desert location. Most probably the movement was the same as or similar to the one later known as the Essenes.
Some of this movement’s regulations opposed what we know of other Jewish teachings and practices from the period. For example, . . . according to the Qumran community’s regulations on the Sabbath, it was forbidden to help anyone out of a well with the aid of an instrument, whereas the rabbis allowed saving a human life. Such Qumran rules may represent the common norms and ideals of their time, whereas the rabbinic rules may reflect an evolution toward leniency.
But the Qumran collection testifies to other groups and authors who are not so easy to identify. Some of the texts may represent widespread Jewish customs or Temple practices (such as daily prayers); others may have their origins in groups similar to the Qumran movement interested in legal interpretations, the study of the Torah, the teaching of wisdom, and in revealing the course of history and divine plan for the elect.
Read more on Bible Odyssey: http://bibleodyssey.org/places/related-articles/judaisms-at-qumran