Exodus 30:35-37

35And thou shalt make it into incense, a perfume, after the work of the perfumer, salted, pure, holy.

36And thou shalt beat [some] of it to powder, and put [some] of it before the testimony in the tent of meeting, where I will meet with thee: it shall be unto you most holy.

37And the incense that thou shalt make, ye shall not make for yourselves according to the proportions of it; it shall be unto thee holy to Jehovah.