Luke 1:8-11

Now it happened while Zacharias was serving as priest before God in the appointed order of his priestly division, as was the custom of the priesthood, he was chosen by lot to enter [the sanctuary of] the temple of the Lord and burn incense [on the altar of incense]. [Ex 30:7] And all the congregation was praying outside [in the court of the temple] at the hour of the incense offering. And an angel of the Lord appeared to him, standing to the right of the altar of incense.