Leviticus 24:3

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.

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