Leviticus 24:2-4

New Century Version

² “Command the people of Israel to bring you pure oil from crushed olives. That oil is for the lamps so that these lamps may never go out. ³ Aaron will keep the lamps burning in the Meeting Tent from evening until morning before the Lord; this is in front of the curtain of the Ark of the Agreement. This law will continue from now on. ⁴ Aaron must always keep the lamps burning on the lampstands of pure gold before the Lord.