Leviticus 24:1-4

Then the LORD spoke to Moses, saying, “Command the children of Israel to bring to you clear oil from beaten olives for the light [of the golden lampstand], to make a lamp burn continually. Outside the veil of the Testimony [between the Holy Place and the Most Holy Place] in the Tent of Meeting, Aaron shall always keep the lamps burning before the LORD from evening until morning; it shall be a permanent statute throughout your generations. He shall keep the lamps burning on the pure gold lampstand before the LORD continually. [Rev 1:12-18]