Leviticus 24:1-4

Then the LORD spoke to Moses, saying, “Command the sons of Israel that they bring to you clear oil from beaten olives for the light, to make a lamp burn continually. Outside the veil of testimony in the tent of meeting, Aaron shall keep it in order from evening to morning before the LORD continually; it shall be a perpetual statute throughout your generations. He shall keep the lamps in order on the pure gold lampstand before the LORD continually.