Exodus 30:8-10

Revised Standard Version

⁸ and when Aaron sets up the lamps in the evening, he shall burn it, a perpetual incense before the Lord throughout your generations. ⁹ You shall offer no unholy incense thereon, nor burnt offering, nor cereal offering; and you shall pour no libation thereon. ¹⁰ Aaron shall make atonement upon its horns once a year; with the blood of the sin offering of atonement he shall make atonement for it once in the year throughout your generations; it is most holy to the Lord.”