Ezekiel 41:6

And he built, against the wall of the house, stories encompassing the walls of the house around both the nave and the inner sanctuary; thus he made side chambers all around.

Then he measured the wall of the house of Yahweh, six cubits; and the width of the side chambers, four cubits, all around about the house on every side.

For they were in three stories and had no pillars like the pillars of the courts; therefore the upper chambers were set back from the ground upward, more than the lower and middle ones.

Then a measuring rod like a staff was given to me, saying, “Get up and measure the sanctuary of God and the altar, and those who worship in it.