Sefer Iyunei Deah is a collection of investigations (‘Iyunim’) into Hilchos Yoreh Deah based on the bechinos of Rabbi Zalman Nechemia Goldberg in Isur v’Heter (melicha, basar b’chalav, ta’arovos) and Nida. This book has proven to be very valuable to Torah scholars aspiring to learn the material required for rabbinic ordination – “semicha”.
The book consists of one volume with 100 chapters (referred to as ‘Iyunim’) – 72 on Isur v’Heter and 28 on Nida – which analyze in depth and summarize the main principles of these two very central areas of halacha. In addition, the book has extensive source references for each ‘Iyun’ and also includes the original versions of R’ Goldberg’s test questions at the end. There are a total of approx. 600 pages.
Iyunei Deah has received the approbations of Rabbi Zalman Nechemia Goldberg, R’ Moshe Halbershtam, R’ Moshe Meir Leiffer, R’ Mendel Weinbach, R’ Yonason Weiner, R’ Nachum Borowsky and R’ Dovid Koenig. It has been very well received by the Torah learning community in Israel, North and South America, Europe, South Africa and Australia.