Ezekiel 42:1, 3, 7-9, 14

Then he brought me out into the outer court, by the way toward the north; and he brought me into the chamber which was opposite the separating courtyard, and which was opposite the building toward the north.

Opposite the inner court of twenty cubits, and opposite the pavement of the outer court, was gallery against gallery in three stories.

And a wall which was outside ran parallel to the chambers, at the front of the chambers, toward the outer court; its length was fifty cubits. The length of the chambers toward the outer court was fifty cubits, whereas that facing the temple was one hundred cubits. At the lower chambers was the entrance on the east side, as one goes into them from the outer court.

When the priests enter them, they shall not go out of the holy chamber into the outer court; but there they shall leave their garments in which they minister, for they are holy. They shall put on other garments; then they may approach that which is for the people.”