Exodus 30:21
Thus they are to wash their hands and feet so that they will not die; this shall be a permanent statute for Aaron and his descendants for the generations to come."

Exodus 30:23
"Take the finest spices: 500 shekels of liquid myrrh, half as much (250 shekels) of fragrant cinnamon, 250 shekels of fragrant cane,

Numbers 4:16
Eleazar son of Aaron the priest shall oversee the oil for the light, the fragrant incense, the daily grain offering, and the anointing oil. He has oversight of the entire tabernacle and everything in it, including the holy objects and their utensils."