Dor Daim, "The Generation of Knowledge": This group emerged as a recognizable force in the early part of the 19th century. Although they were most certainly connected with the earliest Yemenite group in existence — who held according to the documentation recorded by the RAMBAM (Maimonides). Any one calling them a brand new reformer group should keep this fact in mind. They were actually an extension of the earliest Rambam group.

This group was greatly discouraged by the infiltration of Mysticism that had invaded Yemen in the 1600s. Century after century, the core beliefs of Judaism — as represented by the Sanhedrin — were being diminished in favor of the new (disputable) Mysticism of the Zohar Kabalists. Kabalists (mystics) were introducing ideas that were causing the masses to abandon their ancient prayer book and law. Also, the anti-scientific and anti-progressive attitude of the Mystics was causing the economic situation to continue to decline for the Jews of Yemen. They didn't want to better their lives (socially, economically or scientifically) anymore. With this in mind, Mori Yihhyah Qafahh zs"l started this movement to revive and protect the original form of Judaism as was codified by the Sandhedrin during the 1st through 3rd centuries. According to scholars, his family line was responsible for preserving the oldest and most accurate version of the Rambam's code of Jewish Law.

Unfortunately, they were not well received in Israel. One of the group's leaders was placed in jail and threatened with excommunication by the Jerusalem Kabalists. They even tried to force him to convert to another religion. In the end, he had to sign papers that disavowed their beliefs. To this day, a small number of Dor Daim members still exist who maintain an almost secret existence out of fear. The main cause of their persecution had to do with their views on the main book of Kabala known as the Zohar.