Ezekiel 42:13-14

13Then he said to me, “The north chambers and the south chambers which face the courtyard are holy chambers where the priests who approach the Lord will eat the most holy offerings. There they will place the most holy offerings – the grain offering, the sin offering, and the guilt offering, because the place is holy.

14When the priests enter, then they will not go out from the sanctuary to the outer court without taking off their garments in which they minister, for these are holy; they will put on other garments, then they will go near the places where the people are.”