John Wesley on Ezekiel 40:5

A wall - This was that outmost wall, that compassed the whole mount Sion, upon whose top the temple stood. The man's hand - Christ, hath, and keeps the reed in his own hand, as the only fit person to take the measures of all. A measuring reed - Or cane, for this measuring rod was of those canes growing in that country, long, and light, which architects made use of. Six cubits long - Each cubit consisting of eighteen inches in our common account. An hand breadth - Added to each six cubits. The breadth - The thickness of the walls, which were one reed, and one hand's breadth, or three yards, and three inches thick. Height - And the height equal, taking the measure from the floor on the inside of the wall.