One of the important situations in the history of incense in the life of the saints is that the angel of the Lord appeared to Zacharias the priest on the right side of the altar of incense while he was burning incense in his lot (Lk.1: 8-11). This is proof of the sanctity of the place and the sanctity of the work of offering incense. This holy occasion was worthy to be associated with a Divine revelation.
It is clear from the incident of Zacharias' burning incense in his lot that offering incense was a separate work in itself; it was not connected with the offering of a sacrifice or burnt offering.