Charles Ellicott Commentary Ezekiel 42:14

"When the priests enter in, then shall they not go out of the holy place 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 pertaineth to the people." — Ezekiel 42:14 (ASV)

There they shall lay their garments. —It was apparently the requirement of the law that the priests should wear their official garments only when engaged in priestly duties within the tabernacle. This is not expressly stated in general terms, but it is said that they were to wear them when engaged in such duty (Exodus 28:43), and in some particular cases, that they were to put them off when they went out of the tabernacle (Leviticus 6:10–11; Leviticus 16:23). It seems probable, therefore, that Ezekiel here recognizes the ancient custom.