Exodus 30:7-10

7And Aaron shall burn thereon fragrant incense: every morning, when he dresseth the lamps, he shall burn the incense.

8And when Aaron lighteth the lamps between the two evenings, he shall burn the incense — a continual incense before Jehovah throughout your generations.

9Ye shall offer up no strange incense thereon, nor burnt-offering, nor oblation; neither shall ye pour drink-offering thereon.

10And Aaron shall make atonement for its horns once in the year: with the blood of the sin-offering of atonement shall he make atonement for it, once in the year, throughout your generations: it is most holy to Jehovah.