Exodus 30:6-9

You shall put the altar of incense [in the Holy Place] in front and outside of the veil that screens the ark of the Testimony, before the mercy seat that is over the Testimony, where I will meet with you. Aaron shall burn sweet and fragrant incense on it; he shall burn it every morning when he trims and tends the lamps. [Ps 141:2; Rev 5:8; 8:3, 4] When Aaron sets up the lamps at twilight, he shall burn incense, a perpetual incense before the LORD throughout your generations. You shall not offer any strange incense on this altar, or burnt offering or meal offering; you shall not pour out a drink offering on it.