Luke 1:5-12

In the days of Herod [the Great], king of Judea, there was a certain priest whose name was Zacharias, of the division of Abijah. His wife was a descendant of Aaron [the first high priest of Israel], and her name was Elizabeth. They both were righteous (approved) in the sight of God, walking blamelessly in all the commandments and requirements of the Lord. But they were childless, because Elizabeth was barren, and they were both far advanced in years. 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. When Zacharias saw the angel, he was troubled and overcome with fear.