Exodus 30:34-36

ADONAI said to Moshe, "Take aromatic plant substances - balsam resin, sweet onycha root and bitter galbanum gum - these spices along with frankincense, all in equal quantities;

and make incense, blended and perfumed as would an expert perfume-maker, salted, pure and holy.

You are to grind up some of it very finely and put it in front of the testimony in the tent of meeting where I will meet with you; you are to regard it as especially holy.