‘Then he went inward and measured each post of the entrance, two cubits, and the entrance six cubits, and the breadth of the entrance seven cubits. And he measured its length, twenty cubits, and its breadth, twenty cubits, before the temple. And he said to me, “This is the most holy place”.'
Notice ‘he went inward'. No longer ‘he brought me' (Ezekiel 40:28; Ezekiel 40:32; Ezekiel 40:35; Ezekiel 40:48; Ezekiel 41:1). For Ezekiel could not enter the most holy place. That could only be entered by man once a year, and only by the High Priest on the Day of Atonement after specific and detailed preparation (Leviticus 16:2; Leviticus 16:15-16; Hebrews 9:7). The entrance is now only six cubits wide. Entry is even more restricted, indicating the increased holiness of the inner room.
And it is foursquare, twenty cubits by twenty cubits, the ultimate in perfection. The seven cubits measures from each side of the door to the wall, thus with the six cubit door making twenty cubits. The two sevens, representing divine perfection, explain why the door is six cubits, but there may also be the indication that this Isaiah 2 x 3 cubits, indicating double completeness (as the previous door was 2 x 5 cubits, indicating covenant related). The emphasis is on the perfection and extreme holiness of this inner room. Even the heavenly visitor has to say in awe, ‘this is the most holy place'. It was the place to which the glory of Yahweh would return.
And so we have at last reached the holiest of all. We have ascended increasing levels of steps three times, seven, eight and ten, (twenty five in all, which is significant - the covenant number squared), and we have come through narrower and narrower doors, three times, to enter this holiest of all. We now but await the return of Yahweh to His land.