Luke 1:5-8, 11

There was in the days of Herod, the king of Judea, a certain priest named Zacharias, of the division of Abijah. His wife was of the daughters of Aaron, and her name was Elizabeth. And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless. But they had no child, because Elizabeth was barren, and they were both well advanced in years. So it was, that while he was serving as priest before God in the order of his division

Then an angel of the Lord appeared to him, standing on the right side of the altar of incense.