יחזקאל, פרק מ״א, פסוק ד׳

The focus of the measurement now shifts to the innermost and holiest room of the building. As the space is measured, its length and width are both found to be exactly twenty cubits. The primary approach among commentators is that the dimensions of this inner chamber perfectly match and run parallel to the width of the adjacent main hall. This architectural layout directly mirrors the inner sanctuary built by King Solomon, as well as the design of the Second Temple.

Throughout this process, an angel guides the prophet and speaks directly to him [מצודת דוד]. Upon completing the measurement, the angel officially declares the space to be the Holy of Holies. However, this declaration serves a greater purpose than simply identifying the room; it is meant to resolve a historical uncertainty. During the era of the Second Temple, there was a lingering doubt regarding the exact status of the space occupied by the partition wall that separated the main holy area from the Holy of Holies. It was unclear whether the thickness of this wall belonged to the sacred inner chamber or the outer hall. The angel's precise phrasing clarifies that only the exact twenty-cubit area constitutes the Holy of Holies. The physical space taken up by the dividing wall belongs entirely to the outer section and is not considered part of the holiest chamber [מלבי״ם].