Exodus 30:7-10

7Aaron must burn fragrant incense on it; he must burn it every morning when he tends the lamps.

8When Aaron sets up the lamps at twilight, he must burn incense. There is to be an incense offering before the Lord throughout your generations.

9You must not offer unauthorized incense on it, or a burnt or grain offering; you are not to pour a drink offering on it.

10“Once a year Aaron is to perform the atonement ceremony for the altar. Throughout your generations he is to perform the atonement ceremony for it once a year, with the blood of the sin offering for atonement on the horns. The altar is especially holy to the Lord.”