Ezekiel 41:3

Went he inward - Toward the holy of holies. It is not said, “he brought me in,” but “he went in,” because the holy of holies was not to be entered even by a priest like Ezekiel, but only by the high priest once a year. So the “angel” enters and announces: the measurements.

The post of the door - On either side of the entrance was a pillar, the two together making up two cubits. The first measurement of the door was from “post to post,” six cubits; and the second measurement, the “breadth of the door,” was the breadth of the actual doors which shut off the holy of holies Ezekiel 41:23, and which may have been so, hung that each of the “posts” projected half a cubit beyond the hinge of the door (which opened inwards), so as to secure the complete closure of the holy of holies.