Ezekiel 42:13-14

13Then the man said to me, “The north and south chambers facing the temple courtyard are the 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 offerings, the sin offerings, and the guilt offerings—for the place is holy. 14Once the priests have entered the holy area, they must not go out into the outer court until they have left behind the garments in which they minister, for these are holy. They are to put on other clothes before they approach the places that are for the people.”