Exodus 30:9 "You shall offer no strange incense on it, nor burnt-offering nor meal-offering; neither shall you pour drink-offering upon it"

Besides the Altar where sacrifices were offered, there is another Altar covered with gold inside the Beit HaMikdash. This Altar was used for burning incense.

We are prohibited from using this Golden Altar for any other type of offerings besides that of the incense.