18) Furthermore, there is another proof that is not based on the tradition received from Moses, for we find disagreements among the Kabbalists regarding its quality and essence. One says it should be done this way, and another says it should be done that way. This is a conclusive proof that it is not a law given to Moses at Sinai, as you have suggested. In fact, the Rambam (Maimonides) stated in Hilchot Mamrim, Chapter 1, that there is no disagreement at all in matters of tradition.
And any matter in which you find disagreement is known that it is not a tradition from Moses, my teacher. Since all the proofs we bring are from the words of the Sages, the authors of the Mishnah and the Talmud, the true Midrashim, the Geonim, and the Poskim who are undoubtedly the possessors of the true tradition from Moses, my teacher. And anyone who contradicts their words is a heretic and an epicurean.
So how can you claim to search and investigate the words of the authors of the new Kabbalah? One of the distinguished sages of the Yemenite scholars, Rabbi Yitzhak Tzahari, already testified in his sermons on Parashat Lech Lecha, saying, 'And I have come to tell you a few brief words of the new Kabbalah that have recently emerged.' And this testimony serves as an enhancement for us to strengthen our words, for these are new teachings that were not known to our early sages.
The survival of their books testifies and declares the truth, as they are found in our possession in the great Midrash of Rabbi David ben Amram Ish Edan, as mentioned by Rabbi Yitzhak in his poems on Parashat Bereshit and at the beginning of Devarim. Similarly, it is stated in the book Segulat Yisrael, the book Nur al-Tsalam by Rabbi Nethanel ben Yeshua, and the Midrash Hefetz by Rabbi Yehiya HaRofe, may their souls be blessed.