Ezekiel 42:12 (KJV)

The chambers were in the thickness of the wall of the court toward the east, over against the separate place, and over against the building.

And the way before them was like the appearance of the chambers which were toward the north, as long as they, and as broad as they: and all their goings out were both according to their fashions, and according to their doors.

And according to the doors of the chambers that were toward the south was a door in the head of the way, even the way directly before the wall toward the east, as one entereth into them.

Then said he unto me, The north chambers and the south chambers, which are before the separate place, they be holy chambers, where the priests that approach unto the Lord shall eat the most holy things: there shall they lay the most holy things, and the meat offering, and the sin offering, and the trespass offering; for the place is holy.

When the priests enter therein, then shall they not go out of the holy place into the utter court, but there they shall lay their garments wherein they minister; for they are holy; and shall put on other garments, and shall approach to those things which are for the people.