Ezekiel 42:13-14

Then he said to me, “The north and south rooms adjacent to the open area are holy rooms where the priests who come before GOD eat the holy offerings. There they place the holy offerings—grain offerings, sin offerings, and guilt offerings. These are set-apart rooms, holy space. After the priests have entered the Sanctuary, they must not return to the outside courtyard and mingle among the people until they change the sacred garments in which they minister and put on their regular clothes.”