Leviticus 24:2-4

2“Command the sons of Israel that they bring to you 1clear oil from beaten olives for the 2light, to make a lamp 3burn continually. 3Outside the veil of the testimony in the tent of meeting, Aaron shall keep it in order from evening to morning before the Lord continually; it shall be a permanent statute throughout your generations. 4He shall keep the lamps in order on the 4pure gold lampstand before the Lord continually.