Matthew Poole and continuators on Exodus 28:35

35 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 .

For his disobedience or carelesness. For though the matter might seem small in it self yet it was an errour in Gods worship, wherein God is more severe than in other things, and it was an errour of the High-priest, who had more knowledge of Gods mind herein, and was obliged to more care and diligence, not onely for himself, but for the influence of his bad example upon the people.

Marginal references: Ecclesiastic. 45. 9.