Oil for the Perpetual Lamp

Exodus 27:20-21

`And thou--thou dost command the sons of Israel, and they bring unto thee pure beaten olive oil for the light, to cause the lamp to go up continually;

in the tent of meeting, at the outside of the vail, which is over the testimony, doth Aaron--his sons also--arrange it from evening till morning before Jehovah--a statute age-during to their generations, from the sons of Israel.