Ezekiel 40:3-7

So He brought me there; and behold, there was a man whose appearance was like the appearance of bronze, with a thread of flax and a measuring rod in his hand; and he was standing in the gateway.

And the man said to me, “Son of man, see with your eyes, hear with your ears, and pay attention to all that I am going to show you; for you have been brought here in order to show it to you. Declare to the house of Israel all that you see.” Measurements Relating to the Temple

And behold, there was a wall on the outside of the temple all around, and in the man’s hand was a measuring rod of six cubits, each of which was a cubit and a hand width. So he measured the thickness of the wall, one rod; and the height, one rod.

Then he went to the gate which faced east, went up its steps, and measured the threshold of the gate, one rod in width; and the other threshold was one rod in width.

The guardroom was one rod long and one rod wide; and there were five cubits between the guardrooms. And the threshold of the gate by the porch of the gate facing inward was one rod.