Exodus 28:35

35The robe
Heb “it”; the referent (the robe) has been specified in the translation for clarity.
is to be on Aaron as he ministers,
The form is a Piel infinitive construct with the lamed (ל) preposition: “to minister” or “to serve.” It may be taken epexegetically here, “while serving,” although S. R. Driver takes it as a purpose, “in order that he may minister” (Exodus, 308). The point then would be that he dare not enter into the Holy Place without wearing it.
and his sound will be heard
God would hear the bells and be reminded that this priest was in his presence representing the nation and that the priest had followed the rules of the sanctuary by wearing the appropriate robes with their attachments.
when he enters the Holy Place before the Lord and when he leaves, so that he does not die.

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