A significant portion, and perhaps the highlight, of the repetition of the Yom Kippur mussaf is the description of the Yom Kippur service as preformed in the temple. Many, however, are unfamilar with this service. There is an excellent book on the korbonot generally which devotes a portion to describing the Yom Kippur service, including the disagreeements amongst some Medievil commentors. The portion on the Yom Kippur service is highly readable and full of facintating details.

R. Raphael Nathan Nata Rabbinovicz, famous for his Dikdukei Soferim, (also recently reprinted) published the work of his Rebbi and father-in-law, R. Yosef Fadua, Ikrei haAvoda, in 1863.

The first printing was titled Ikrei haAvoda and the second printing in 1910, the book’s title became Ikrei haKorbonot.

R. Yisrael Meyer Kagan, (Hafetz Hayyim) promoted the republication in 1910 and according to the publisher, the Hafetz Hayyim himself wanted to republish this book due to its importance. The Hafetz Hayyim thus allowed for the inclusion of his introduction to his own work on the korbonot, “Asefat Zekanim.” This introduction includes why studying the korbonot is so important event today when one can’t offer them. The publisher also states that at that time (1910) the first edition was exteremly rare and thus there was a need to republish the book.

Although, the printer does not offer why he changed the title, perhaps due to the inclusion of this additional materials that he felt he was kone b’shinu ma’ashe.

This book was recently republished by Mochon Mishnat Rebi Ahron. In this new edition they have reset the type and added footnotes and some minor corrections. (Although, they have also added some typograpical errors as well. (See, e.g. pp. 82 and 83)). They have kept the second title, Ikrei haKorbonot. I purchased this book at Beigeleisen books in Boro Park.