The same precept as in Exodus 30:32 and Exodus 30:33 : the setting it apart as holy, implies the importance of the thing itself.
Related Commentaries of Exodus 30:37
Exodus 30:37-38
37 And as for the perfume which thou shalt make, ye shall not make to yourselves according to the composition thereof: it shall be unto thee holy for the LORD.
38 Whosoever shall make like unto that, to smell thereto, shall even be cut off from his people.