Leviticus 24:2-4

2“Command the Israelites to bring you pure oil from crushed olives for the light, in order to keep the lamp burning regularly.

3Aaron is to tend it continually from evening until morning before the Lord outside the curtain of the testimony in the tent of meeting. This is a permanent statute throughout your generations.

4He must continually tend the lamps on the pure gold lampstand in the Lord’s presence.