Holy of Holies

The Holy of Holies refers to the most sacred area of the Tabernacle and later also of the Temple in Jerusalem. This sanctuary was called the Holy of Holies, or Most Holy Place. It was the inner part of the Tabernacle. There, during the First Temple, the Ark of the Covenant was kept. In this place, only the High Priest could enter and only on the day of Yom Kippur, to offer incense in the ritual of atonement. There was a partition of cedar wood between the Holy Place and the most Holy Place.

Biblical description
Initially, the Holy of Holies was the most inner and sacred part of the tabernacle. As it can be read in Exodus:

In the book of 2 Chronicles it is possible to watch the dimensions of the Holy of Holies in the first Temple, the Temple of Solomon: