This measurement is across the gate-building from north to south. The breadth of the gate-building was exactly half its length Ezekiel 40:15.

He measured then the gate from the roof of one little chamber to the roof of another,.... That is, the whole porch, from the extreme part of the roof of one of the little chambers on the north side, to the extreme part of the roof of another of the little chambers on the south; of the roof of these chambers, and the spiritual meaning of it; see Gill on Ezekiel 40:7,

the breadth was five and twenty cubits; reckoning six cubits to one chamber on one side, and six to one chamber on the other side, which make twelve; and a cubit and a half to each back wall of the chambers on the north and south; or two cubits to the spaces before the chambers, and a cubit and a half to each of the caves of the chambers, which either way make fifteen cubits; and ten cubits the breadth of the gate; in all five and twenty cubits; or fourteen yards and three inches:

door against door; not the door of the outward gate against the door of the inward gate; nor the door of one of the little chambers at the east, to the door of another at the west, running lengthways, and so affording a sight quite through the temple; but the door of one of them on the north side over against the door of another on the south, they answering exactly to each other; which still more confirms the similarity and equality of Gospel churches; See Gill on Ezekiel 40:7.

He measured then the gate from the roof of one little chamber to the roof of another: the breadth was five and twenty cubits, door against door.

40:13 From the roof - From the extremity of one little chamber on the north side of the gate, to the extremity of the opposite chamber on the south side, and so one cubit and half for the back wall of one chamber, and as much for the back wall of the other chamber, with the length of the chambers, six cubits each, and ten for the breadth of the gate, amounts to twenty five cubits. Door against door - It seems the doors of the chambers were two in each chamber in the east and west parts, and so exactly set, that the doors being all open you had a clear prospect through all the chambers to the temple.

40:1-49 The Vision of the Temple. - Here is a vision, beginning at ch. 40, and continued to the end of the book, ch. 48, which is justly looked upon to be one of the most difficult portions in all the book of God. When we despair to be satisfied as to any difficulty we meet with, let us bless God that our salvation does not depend upon it, but that things necessary are plain enough; and let us wait till God shall reveal even this unto us. This chapter describes two outward courts of the temple. Whether the personage here mentioned was the Son of God, or a created angel, is not clear. But Christ is both our Altar and our Sacrifice, to whom we must look with faith in all approaches to God; and he is Salvation in the midst of the earth, Ps 74:12, to be looked unto from all quarters.