‘Abodah is an essential part of the Musaf service of that day, based upon the detailed account given in the Mishnah Yoma of the sacrificial service performed by the high priest in the Temple at Jerusalem. The basis for this elaborate function is found in Lev. xvi. Originally this part of the service seems to have consisted only in the recital of the Mishnah treatise, Yoma. Gradually it was further elaborated, and became the most solemn and impressive portion of the Yom Kippur service.