Jamieson, Fausset and Brown on Exodus 30:34-38

34-38. the Lord said unto Moses, Take unto thee sweet spices--These were:

stacte--the finest myrrh;

onycha--supposed to be an odoriferous shell;

galbanum--a gum resin from an umbelliferous plant.

frankincense--a dry, resinous, aromatic gum, of a yellow color, which comes from a tree in Arabia, and is obtained by incision of the bark. This incense was placed within the sanctuary, to be at hand when the priest required to burn on the altar. The art of compounding unguents and perfumes was well known in Egypt, where sweet-scented spices were extensively used not only in common life, but in the ritual of the temples. Most of the ingredients here mentioned have been found on minute examination of mummies and other Egyptian relics; and the Israelites, therefore, would have the best opportunities of acquiring in that country the skill in pounding and mixing them which they were called to exercise in the service of the tabernacle. But the recipe for the incense as well as for the oil in the tabernacle, though it receives illustration from the customs of Egypt, was peculiar, and being prescribed by divine authority, was to be applied to no common or inferior purpose.