Holy of Holies
The tractate describes how the Temple was divided into three halls: the "Ulam" (Antechamber), the "Kodesh" or "Heichal" (Inner Sanctuary); and the "Kodesh Hakedoshim", the Holy of Holies. The Kohen Gadol (high priest) entered the Holy of Holies only once a year on the holiest day of the Jewish year, Yom Kippur. During the First Temple era, the Ark of the Covenant containing the tablets of the Ten Commandments and the Torah scroll written by Moses is said to have stood in the Holy of Holies. During the Second Temple era, the Holy of Holies was empty except for the large stone called the Foundation Stone ("Evven Hashtiya") on which the Ark had been placed.