Leviticus 24:2-4

2“Command the children of Israel that they bring to you pure oil of pressed olives for the light, to make the lamps burn continually.

3Outside the veil of the Testimony, in the tabernacle of meeting, Aaron shall be in charge of it from evening until morning before the Lord continually; it shall be a statute forever in your generations.

4He shall be in charge of the lamps on the pure gold lampstand before the Lord continually.