Sidur Tephillah LeMoshe - Sidur Ohr Hayashar. With commentary by R. Moshe Cordovero and R. Meir Hakohen Poppers. Edited by R. Tzvi Hirsch Chazan. And with Derech Chaim by R. Jacob of Lissa.

The Kabbalistic commentary by Moshe Cordovero was printed from a manuscript in the library of R. Yisrael of Sadigura. Contains approbations by most of the major Chassidic Rebbes of the period who extol the importance of this commentary. The Ohr Hayashar section, as edited by R. Tzvi Hirsch Chazan, is also held in the highest esteem within Chassidic circles. The first Rebbe of Belz, R. Shalom, stated that his “initial entry to Yirath Shamayim was through this work” (see the approbation by R. Yehoshua of Belz here).