Leviticus 24:1-4

Then ADONAI spoke to Moses saying: “Order Bnei-Yisrael to bring to you pure olive oil, beaten for the light, to keep a lamp burning continually. Outside of the curtain of the Testimony, in the Tent of Meeting, Aaron is to keep it in order from evening to morning before ADONAI continually. It is to be a statute forever throughout your generations. He is to keep the lamps in order on the pure gold menorah before ADONAI continually.