Outside the veil of the Testimony in the Tent of Meeting, Aaron is to tend the lamps continually before the LORD from evening until morning. This is to be a permanent statute for the generations to come.

Leviticus 3:17
This is a permanent statute for the generations to come, wherever you live: You must not eat any fat or any blood."

Leviticus 24:2
"Command the Israelites to bring you pure oil of pressed olives for the light, to keep the lamps burning continually.

Leviticus 24:4
He shall tend the lamps on the pure gold lampstand before the LORD continually.

Numbers 18:5
And you shall attend to the duties of the sanctuary and of the altar, so that wrath may not fall on the Israelites again.

1 Samuel 3:3
Before the lamp of God had gone out, Samuel was lying down in the temple of the LORD, where the ark of God was located.

Without the veil of the testimony, in the tabernacle of the congregation, shall Aaron order it from the evening to the morning before the LORD continually: it shall be a statute for ever in your generations.