What does this verse mean? Exod.28:43 And they shall be upon Aaron,?

Aaron and his descendants will be the priests in the tabernacle. the chapter has the requirements they are to follow in the holy place. It is so holy that they must be very careful not to bring any sin of their own into the holy place or they will die. There was a practice of tying a rope around the leg of the priest in case he died in that place, so he could be dragged out.