Leviticus 24:2-4

24:2 “Command the Israelites to bring to you pure oil of beaten olives for the light, to make a lamp burn continually. 24:3 Outside the veil-canopy of the congregation in the Meeting Tent Aaron must arrange it from evening until morning before the Lord continually. This is a perpetual statute throughout your generations. 24:4 On the ceremonially pure lampstand he must arrange the lamps before the Lord continually.