Exodus 27:20-21 Modern English Version (MEV)
The Oil for the Lamp
20 You shall command the children of Israel that they bring you pure oil of olive pressed for the light, to cause the lamp to burn continually. 21 In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall arrange it from evening to morning before the Lord. It shall be a perpetual statute for the children of Israel for generations to come.