Aaron must wear the robe whenever he ministers, and its sound will be heard when he enters or exits the sanctuary before the LORD, so that he will not die.
KJV
And it shall be upon Aaron to minister: and his sound shall be heard when he goeth in unto the holy [place] before the LORD, and when he cometh out, that he die not.
ASV
And it shall be upon Aaron to minister: and the sound thereof shall be heard when he goeth in unto the holy place before Jehovah, and when he cometh out, that he die not.