I've seen the book Otzrot Hayyim recommended as the best first text to use when starting to learn the system of the Ari. When was this book published and where did it come from? References to Kitvei ...
Most (but not all) Siddurim have the פסוק of ויהי נועם at the end of הנני מוכןs (such as before ספירת העומר, before the ארבע כוסות, or before בדיקת חמץ). Where does this practice come from and why is ...