Oil for the Perpetual Lamp

Exodus 27:20-21

"You are to order the people of Isra'el to bring you pure oil of pounded olives for the light, and to keep a lamp burning continually.

Aharon and his sons are to put it in the tent of meeting, outside the curtain in front of the testimony, and keep it burning from evening until morning before ADONAI. This is to be a permanent regulation through all the generations of the people of Isra'el.