Ezekiel 42:13-14

13Then the man said to me, “The northern and southern chambers that face the courtyard are the holy chambers where the priests who approach the Lord will eat the most holy offerings. There they will deposit the most holy offerings — the grain offerings, sin offerings, and guilt offerings — for the place is holy.

14Once the priests have entered, they are not to go out from the holy area to the outer court until they have removed the clothes they minister in, for these are holy. They are to put on other clothes before they approach the public area.”