As is true in every work of halachah, we have navigated a path through the sea of Poskim. In this volume we have mainly relied upon the rulings presented in the most recent seforim dealing with this subject. Their rulings, in turn, are based upon the rulings of the greatest Sages of this generation and of previous generations. They are:

Dvar Halachah by Rabbi Avraham Halevi Hurvitz

Nitei Gavriel by Rabbi Gavriel Zinner

Toras HaYichud by Rabbi Pinchas Eliyahu Rabinovitz

Minchas Ish by Rabbi Ayal Shraga

We have also in general cited the ruling of the Rema in the text, it being the Ashkenazic custom, and we have highlighted in the footnotes the ruling of the Bet Yosef, the Sefardic custom.

Acknowledgments

First and foremost, I would like to thank all the students at the Bnos Menachem Yad Ramah Seminary at Bournemouth UK and the Lubavitch Girls' Senior School, London UK. This volume was prepared as an outcome of my teaching these students.

I send my warmest thanks to Rabbi L. Y. Raskin, Dayan of the Lubavitch community in London, UK for proofreading the book and for his meticulous editing. I would also like to thank Rabbi M. Turetski and Rabbi Y. Rapoport for their valuable comments and suggestions. I thank Rabbi A. Tiefenbrun for research access to his library.

A warm word of gratitude to Rabbi Yonah Avtzon and Yosef Yitzchok Turner of Sichos In English for nurturing this project to fruition, and to Mrs. C. Shloush for her meticulous editing.

Special thanks to my wife and children for all their support in our joint shlichus.

Rabbi Nissan Dovid Dubov

22nd Shvat 5766