Exodus 28 35
Aaron is to wear the robe whenever he serves, and the sound it makes will be heard when he enters or leaves the sanctuary as he goes into the Lord's presence, so that he won't die.
Compare with other 3 random translations
ASV Exodus 28:35And 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.
GW Exodus 28:35Aaron must wear it when he serves as priest. The sound of the bells must be heard when he comes into and goes out of the Lord’s presence in the holy place so that he won’t die.
EAS Exodus 28:35Aaron must wear the robe when he is serving the Lord. The bells will make a noise when he goes into the Holy Place to serve the Lord. They will also make a sound when he comes out. Then he will not die.