Exodus 30:35-37

35and make it into an incense, a perfume, the work of a perfumer. It is to be finely ground, and pure and sacred.

36You are to beat some of it very fine and put some of it before the ark of the testimony in the tent of meeting where I will meet with you; it is to be most holy to you.

37And the incense that you are to make, you must not make for yourselves using the same recipe; it is to be most holy to you, belonging to the Lord.