Cassia Essential Oil

I have to confess something.  Prior to studying the oils of the Bible I had never heard of Cassia, and for sure never Cassia Essential Oil.  Not once in all my years studying the Bible, pouring over every word with a fine tooth comb for seminary papers or Old Testament finals did I ever once see this word recorded.  And yet - here it is in Exodus 30:22-25 (ESV) in the recipe given to Moses by God. 22 The Lord said to Moses, 23 “Take the finest spices: of liquid myrrh 500 shekels, and of sweet-smelling cinnamon half as much, that is, 250, and 250 of aromatic cane, 24 and 500 of cassia, according to the shekel of the sanctuary, and a hin of olive oil. 25 And you shall make of these a sacred anointing oil blended as by the perfumer; it shall…