Exodus 30:35-37

35and thou shalt make of it incense, a perfume after the art of the perfumer, seasoned with salt, pure and holy:

36and thou shalt beat some of it very small, and put 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 which thou shalt make, according to the composition thereof ye shall not make for yourselves: it shall be unto thee holy for the LORD.