Ezekiel 42:13-14

13And he said unto me, The north cells [and] the south cells, which are before the separate place, they are holy cells, where the priests that come near unto Jehovah shall eat the most holy things; there shall they lay the most holy things, both the oblation and the sin-offering and the trespass-offering: for the place is holy.

14When the priests enter in, they shall not go forth from the sanctuary into the outer court, but there they shall lay their garments wherein they minister, for they are holy; and they shall put on other garments, and shall approach to that which is for the people.