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

Then he (the angel) brought me out into the outer courtyard, toward the north; and he led me to the [attached] chamber which was opposite the separate area and opposite the building to the north.

Opposite the twenty cubits which belonged to the inner courtyard, and opposite the pavement which belonged to the outer courtyard, was gallery (balcony) corresponding to gallery in three stories.

And the outer wall, by the side of the chambers, toward the outer courtyard facing the chambers, was fifty cubits long. For the length of the chambers which were in the outer courtyard was fifty cubits, while the length of those facing the temple was a hundred cubits. Below these chambers was the entrance on the east side, as one enters them from the outer courtyard.

When the priests enter [the Holy Place], they shall not go out from the sanctuary into the outer court unless they lay there their garments in which they minister, for these are holy (set apart). They shall put on other garments before they approach that which is for the people.”